Author Question: If the speed of a continuous wave is constant, as you increase the frequency of the wave, the wave ... (Read 86 times)

Alainaaa8 · **on:** Jul 29, 2018

If the speed of a continuous wave is constant, as you increase the frequency of the wave, the wave must have a proportionally _________ wavelength
Fill in the blank(s) with correct word

Question 2

As you increase in altitude in the atmosphere, the speed of sound _________.
Fill in the blank(s) with correct word

Question 3

Combining two sounds of equal intensity will give a sound level __________ higher than the sound level due to just one of them.
Fill in the blank(s) with correct word

Question 4

A sound level of 80 dB has __________ times the amplitude of a 60 dB sound.
Fill in the blank(s) with correct word

Question 5

The only way to make sound travel faster in air is to change the air's ____________.
Fill in the blank(s) with correct word

Question 6

The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is __________.
Fill in the blank(s) with correct word

Question 7

Two uses of ultrasound are __________ and __________.
Fill in the blank(s) with correct word

Question 8

In ultrasound the __________ of the sound is much greater than in normal sound.
Fill in the blank(s) with correct word

Question 9

As you move farther away from a source emitting a pure tone, the __________ of the sound you hear decreases.
Fill in the blank(s) with correct word

Question 10

When two identical waves undergo _______________ interference, the net amplitude is zero.
Fill in the blank(s) with correct word

Question 11

Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of __________.
Fill in the blank(s) with correct word

Question 12

You can hear sound through an open window from sources that are not in your line of sight because of __________.
Fill in the blank(s) with correct word

Question 13

You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is __________.
Fill in the blank(s) with correct word

Question 14

Increasing the speed of waves on a guitar string increases the _________ of the sound it produces.
Fill in the blank(s) with correct word

Question 15

A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is _________ times the frequency of the first wave.
Fill in the blank(s) with correct word

Question 16

Two examples of a transverse wave are __________ and __________.
Fill in the blank(s) with correct word

Question 17

Two examples of a longitudinal wave are __________ and __________.
Fill in the blank(s) with correct word

Question 18

The wavelength of a wave multiplied by the frequency of the wave is the wave's __________.
Fill in the blank(s) with correct word

Question 19

A _________ wave is one with its oscillations perpendicular to the direction of propagation.
Fill in the blank(s) with correct word

Question 20

The maximum displacement of points on a wave from the equilibrium position is the wave's __________.
Fill in the blank(s) with correct word

Question 21

The distance between two successive like' points on a wave is the wave's __________.
Fill in the blank(s) with correct word

Question 22

A complex tone can be produced by combining two or more __________.
Fill in the blank(s) with correct word

Question 23

The number of cycles of a wave passing a point per unit time is the wave's __________.
Fill in the blank(s) with correct word

Question 24

You put one ear on a steel railroad track while your friend a distance of 400 m away taps on the rail with a stone. You will hear the sound through the steel rail in _________ and through the air where the speed of sound is 344 m/s in _______.
a. 0.08 s b. 0.5 s
c. 1.2 s d. 2.4 s

Question 25

In order for two waves to interfere completely destructively, they must
a. have the same amplitude.
b. be exactly out of phase.
c. one wave's peak must align with the other's valley.
d. be transverse waves.
e. all of the above

Question 26

In a plane wave, the wavefronts are
a. circular.
b. flat.
c. parallel.
d. perpendicular to the direction of propagation.

Question 27

An example of a longitudinal wave is
a. a sound wave in air.
b. a wave on a rope.
c. a water wave.
d. a sound wave in a metal bar.
e. none of the above.

Question 28

An example of a transverse wave is a
a. sound wave in air.
b. wave on a rope.
c. water wave.
d. sound wave in a metal bar.
e. none of the above

Question 29

Sound waves propagate in
a. one dimension. b. two dimensions.
c. three dimensions. d. four dimensions.

Question 30

You are on a boat in a fog and know there are cliffs ahead of you somewhere, but you cannot see them. You use your fog horn to send out a blast of sound (assume the temperature of the air is 20 oC) and the time it takes for the sound to return to you is 20.0 s. How far away are the cliffs (in metric units)? Hint: Be careful and think about the physics of the problem. You may want to make a sketch of the situation to help you determine the answer.
a. 1798 m b. 3444 m
c. 3596 m d. 7192 m

Question 31

You are on an island where a huge explosion at a distance of 500 miles away can be heard. How long (in seconds) does it take the sound to travel to your location? Assume the temperature of the air is 20 oC.
a. 1.4 s b. 5.6 s
c. 2340 s d. 8955 s

Question 32

What frequency of sound traveling in air at 40 oC has a wavelength of 0.50 m?
a. 20 Hz b. 344.7 Hz
c. 502.9 Hz d. 711.2 Hz

Question 33

In the upper atmosphere at altitudes where commercial airlines travel, we find extremely cold temperatures. What is the speed of sound (in metric units) for a temperature of 49.0 oC?
a. 984.9 m/s b. 300.8 m/s
c. 344.7 m/s d. 140.7 m/s

Question 34

Harmonics
a. are components of a complex waveform.
b. have frequencies that are integer multiples of the frequency of the complex waveform.
c. are pure tones.
d. have sinusoidal waveforms.
e. all of the above

Question 35

A sound with ten times the amplitude of another sound is judged to be
a. twice as loud. b. ten times as loud.
c. 10 dB higher in sound level. d. 20 dB higher in sound level.

Question 36

If you move twice as far away from a lawn mower running in an open field, the amplitude of the sound you hear will be ___________ what it was before.
a. the same as
b. twice
c. half
d. four times
e. one fourth

Question 37

If one lawn mower causes an 80-dB sound level at a point nearby, four lawnmowers together would cause a sound level of ____________ at that point.
a. 92 dB b. 84 dB
c. 86 dB d. none of the above

Question 38

Combining two sounds of equal intensity will give a sound level ___________ than the sound level due to just one of them.
a. twice as loud b. 3 dB higher
c. 10 dB higher d. 2 dB higher

Question 39

A zero decibel sound level
a. has zero amplitude. b. is nonsense.
c. is just at the threshold of hearing. d. none of the above

Question 40

A sound level of 80 dB has ___________ the amplitude of a 60 dB sound.
a. ten times b. twenty times
c. one tenth d. twice

Question 41

The 3rd harmonic of a complex tone has a frequency of 1,200 Hz. The frequency of the tone is
a. 200 Hz. b. 400 Hz.
c. 600 Hz. d. none of the above.

Question 42

An echo is a sound wave that has been
a. diffracted.
b. refracted.
c. reflected.
d. reverberated.
e. amplified.

Question 43

You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?
a. about a mile b. half a mile
c. a tenth of a mile d. none of the above

Question 44

Doppler radar can
a. catch speeders.
b. measure the speed of a pitcher's fastball.
c. detect tornadoes.
d. do all of the above.

Question 45

You listen to a live orchestra concert from a cheap seat far away, high up in the balcony. The music seems to be a little out of sync with the conductor's beat. Why?
a. The musicians are paying no attention to the conductor.
b. You are noticing a time lag due to the finite speed of sound.
c. The orchestra is not very good.
d. The viola section is dragging.

Question 46

The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is
a. 0.00000034 m.
b. 0.0000034 m.
c. 0.00034 m.
d. 0.34 m.
e. 340,000,000 m.

Question 47

Ultrasound is used
a. to form images of internal organs.
b. by bats to navigate.
c. in automatic focus cameras.
d. to control insects.
e. all of the above

Question 48

In ultrasound the _____________ of the sound is much greater than in normal sound.
a. frequency
b. period
c. wavelength
d. amplitude
e. speed

Question 49

Which of the following is not one of the ways sound can be used?
a. to circulate the refrigerant in a refrigerator
b. to relay information to orbiting satellites
c. to form images of internal organs
d. to measure the air temperature aloft
e. to make a bubble in water produce light

Question 50

Choose the correct statement.
a. The perceived pitch of a sound usually doesn't depend on the sound's frequency.
b. The frequency of each musical note is 10 Hz higher than that of the next lower note.
c. The decibel is the standard measure of tone quality.
d. The perceived loudness of a sound depends somewhat on frequency.

Question 51

As you move farther away from a source emitting a pure tone, the ___________ of the sound you hear decreases.
a. frequency
b. period
c. wavelength
d. amplitude
e. none of the above

Question 52

Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of
a. interference.
b. changing sound level.
c. diffraction.
d. the Doppler effect.
e. shock waves.

Question 53

When two identical waves arrive at the same place in phase, there is
a. constructive interference.
b. destructive interference.
c. diffraction.
d. a Doppler effect.
e. a shock wave.

Question 54

Which of these waves will diffract the most when passing through a 20 cm wide opening in a barrier?
a. a wave with a wavelength of 25 cm
b. a wave with a wavelength of 2 cm
c. a wave with a wavelength of 0.05 cm
d. none of these waves will diffract at all

Question 55

You can hear sound through an open window from sources that are not in your line of sight because of
a. interference.
b. diffraction.
c. the sound level.
d. the Doppler effect.
e. none of the above.

Question 56

A source emits sound at a fixed constant frequency f.If the source moves, the wavelength of the sound in front of the direction of motion is ____________ the wavelength behind the direction of motion.
a. the same as b. larger than
c. smaller than d. unrelated to

Question 57

A source emits sound at a fixed constant frequency f.If the source moves away from you faster than the speed of sound in air, the frequency that you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.

Question 58

A source emits sound at a fixed constant frequency f.If the temperature of the air rises, the frequency you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.

Question 59

A source emits sound at a fixed constant frequency f.If the source moves away from you, and at the same time you run away from the source, the frequency you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.

Question 60

A source emits sound at a fixed constant frequency f.If you run towards the source, the frequency you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.

Question 61

A source emits sound at a fixed constant frequency f.If the source moves away from you, the frequency you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.

Question 62

You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is
a. 85 m.
b. 170 m.
c. 340 m.
d. 680 m.
e. none of the above.

Question 63

A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is _______________ the frequency of the first wave.
a. 1/2 b. the same as
c. 2 times d. unrelated to

Question 64

Which of the following can change the frequency of a wave?
a. interference
b. the Doppler effect
c. diffraction
d. all of the above

Question 65

Two sound waves traveling through the air have different frequencies. Consequently, they must also have different
a. amplitudes.
b. speeds.
c. wavelengths.
d. all of the above

Question 66

If a source of sound is traveling toward you, the speed of the sound waves reaching you is _______________ the speed the sound waves would have had if the source were stationary.
a. faster than
b. slower than
c. the same as

Question 67

You drop a rock in a pond, and the water waves travel away from the rock with a certain speed. You drop a heavier rock in the water. The speed of the waves in the water from the heavier rock
a. remains unchanged.
b. increases.
c. decreases.
d. cannot be determined.

Question 68

When the frequency of the source of a water wave increases, the speed of the waves traveling in the water
a. remains unchanged.
b. increases.
c. decreases.
d. cannot be determined.

Question 69

When the frequency of the source of a water wave increases, the distance between successive peaks in the wave
a. remains unchanged.
b. increases.
c. decreases.
d. cannot be determined.

Question 70

The wavelength of a wave multiplied by the frequency of the wave is the wave's
a. speed.
b. frequency.
c. wavelength.
d. amplitude.
e. loudness.

Question 71

The distance between peaks on a wave divided by the time for the wave to travel this distance is the wave's
a. speed.
b. frequency.
c. wavelength.
d. amplitude.
e. loudness.

Question 72

The maximum displacement of points on a wave from the equilibrium position is the wave's
a. speed.
b. frequency.
c. wavelength.
d. amplitude.
e. loudness.

Question 73

What is the symbol traditionally used to represent wavelength?
a. wl b. y
c. d.

Question 74

The distance between two successive like' points on a wave is the wave's
a. speed.
b. frequency.
c. wavelength.
d. amplitude.
e. loudness.

Question 75

The number of cycles of a wave passing a point per unit time is the wave's
a. speed.
b. frequency.
c. wavelength.
d. amplitude.
e. loudness.

Question 76

What is meant by a wave medium?
a. a wave of moderate amplitude
b. water
c. air
d. any material through which a wave travels

Question 77

Sound waves propagate in two dimensions.
a. True
b. False
Indicate whether the statement is true or false

Question 78

For waves moving through the atmosphere at a constant velocity, higher frequency waves must have proportionally longer wavelengths.
a. True
b. False
Indicate whether the statement is true or false

Question 79

In the troposphere segment of the Earth's atmosphere, as you increase in altitude the temperature decreases. This means the speed of sound decreases as you increase in altitude.
a. True
b. False
Indicate whether the statement is true or false

Question 80

If you increase the linear mass density of a rope, the speed of a wave on the rope also increases.
a. True
b. False
Indicate whether the statement is true or false

Question 81

Telephones don't transmit frequencies above 3,400 Hz. Musical notes should sound normal over the telephone as long as they are below 3,400 Hz.
a. True
b. False
Indicate whether the statement is true or false

Question 82

Your vocal cords are used to produce all the sounds you make while speaking.
a. True
b. False
Indicate whether the statement is true or false

Question 83

Two identical sound producers will sound twice as loud as just one.
a. True
b. False
Indicate whether the statement is true or false

Question 84

A sound with ten times the amplitude of another sound is judged to be ten times as loud.
a. True
b. False
Indicate whether the statement is true or false

Question 85

Combining two sounds of equal intensity will give a sound level 3 dB higher than the sound level due to just one of them.
a. True
b. False
Indicate whether the statement is true or false

Question 86

A zero decibel sound level has zero amplitude.
a. True
b. False
Indicate whether the statement is true or false

Question 87

A sound level of 80 dB has twenty times the amplitude of a 60 dB sound.
a. True
b. False
Indicate whether the statement is true or false

Question 88

Two uses of ultrasound are navigation by bats and controlling insects.
a. True
b. False
Indicate whether the statement is true or false

Question 89

In ultrasound the wavelength of the sound is much smaller than in normal sound.
a. True
b. False
Indicate whether the statement is true or false

Question 90

Reverberation time of a room can be increased by covering the walls with better reflectors of sound.
a. True
b. False
Indicate whether the statement is true or false

Question 91

Reverberation can both inhibit conversation and enhance music.
a. True
b. False
Indicate whether the statement is true or false

Question 92

As you move farther away from a source emitting a pure tone, the frequency of the sound you hear decreases.
a. True
b. False
Indicate whether the statement is true or false

Question 93

In order for two waves to interfere completely destructively, they must have the same amplitude.
a. True
b. False
Indicate whether the statement is true or false

Question 94

Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of diffraction.
a. True
b. False
Indicate whether the statement is true or false

Question 95

When two identical waves arrive at the same place in phase, there is destructive interference.
a. True
b. False
Indicate whether the statement is true or false

Question 96

You can hear sound through an open window from sources that are not in your line of sight because of diffraction.
a. True
b. False
Indicate whether the statement is true or false

Question 97

If the source moves, the wavelength of the sound in front of the direction of motion is smaller than the wavelength behind the direction of motion.
a. True
b. False
Indicate whether the statement is true or false

Question 98

Sound cannot travel through solid steel.
a. True
b. False
Indicate whether the statement is true or false

Question 99

A source emits sound at a fixed constant frequency f.If the source moves away from you faster than the speed of sound in air, you do not hear any frequency but instead a sonic boom.'
a. True
b. False
Indicate whether the statement is true or false

Question 100

A source emits sound at a fixed constant frequency f. If the temperature of the air rises, the frequency you hear is higher than f.
a. True
b. False
Indicate whether the statement is true or false

Question 101

A source emits sound at a fixed constant frequency f.If the source moves away from you, and at the same time you run away from the source, the frequency you hear is the same as f.
a. True
b. False
Indicate whether the statement is true or false

Question 102

A source emits sound at a fixed constant frequency f.If you run towards the source, the frequency you hear is lower than f.
a. True
b. False
Indicate whether the statement is true or false

Question 103

A source emits sound at a fixed constant frequency f.If the source moves away from you, the frequency you hear is lower than f.
a. True
b. False
Indicate whether the statement is true or false

Question 104

A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is half the frequency of the first wave.
a. True
b. False
Indicate whether the statement is true or false

Question 105

The speed of a wave is the same as the speed of the particles displaced by the wave.
a. True
b. False
Indicate whether the statement is true or false

Question 106

Waves carry energy.
a. True
b. False
Indicate whether the statement is true or false

Question 107

Regions of a longitudinal wave where the particles of the medium are squeezed together are called compressions.
a. True
b. False
Indicate whether the statement is true or false

Question 108

Sound in a vacuum is impossible.
a. True
b. False
Indicate whether the statement is true or false

Question 109

A sound wave in a metal bar is an example of a longitudinal wave.
a. True
b. False
Indicate whether the statement is true or false

Question 110

A water wave is an example of a transverse wave.
a. True
b. False
Indicate whether the statement is true or false

Question 111

When the frequency of the source of a water wave increases, the speed of the waves traveling in the water increases.
a. True
b. False
Indicate whether the statement is true or false

Question 112

When the frequency of the source of a water wave increases, the distance between successive peaks in the wave increases.
a. True
b. False
Indicate whether the statement is true or false

Question 113

The wavelength of a wave divided by the frequency of the wave is the wave's speed.
a. True
b. False
Indicate whether the statement is true or false

Question 114

The maximum displacement of points on a wave from the equilibrium position is the wave's wavelength.
a. True
b. False
Indicate whether the statement is true or false

Question 115

The distance between two successive like' points on a wave is the wave's wavelength.
a. True
b. False
Indicate whether the statement is true or false

Question 116

The number of cycles of a wave passing a point per unit time is the wave's period.
a. True
b. False
Indicate whether the statement is true or false

Question 117

The flash from a camera is an example of a continuous wave.
a. True
b. False
Indicate whether the statement is true or false

Question 118

An aluminum wing on a plane is 38 m long when the temperature is 20 oC. At what temperature (in oC) would the wing be 0.04 m shorter? Enter your answer to one decimal place. You should think about the physics of the situation before trying to solve the problem. (Hint: You are being asked for a temperature, not a temperature change).

lin77x · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

shorter

Answer to Question 2

decreases

Answer to Question 3

3 dB

Answer to Question 4

ten

Answer to Question 5

temperature

Answer to Question 6

0.00034 m

Answer to Question 7

forming images of internal organs, navigation by bats, automatic focus cameras, controlling insects

Answer to Question 8

frequency

Answer to Question 9

amplitude

Answer to Question 10

destructive

Answer to Question 11

interference

Answer to Question 12

diffraction

Answer to Question 13

340 m

Answer to Question 14

frequency (or pitch)

Answer to Question 15

2-Jan

Answer to Question 16

waves on a rope, water waves

Answer to Question 17

sound waves, longitudinal waves in a Slinky

Answer to Question 18

speed

Answer to Question 19

transverse

Answer to Question 20

amplitude

Answer to Question 21

wavelength

Answer to Question 22

pure tones

Answer to Question 23

frequency

Answer to Question 24

a, c

Answer to Question 25

a, b, c

Answer to Question 26

b, c, d

Answer to Question 27

a, d

Answer to Question 28

b, c

Answer to Question 29

c

Answer to Question 30

b

Answer to Question 31

c

Answer to Question 32

d

Answer to Question 33

b

Answer to Question 34

e

Answer to Question 35

d

Answer to Question 36

c

Answer to Question 37

c

Answer to Question 38

b

Answer to Question 39

c

Answer to Question 40

a

Answer to Question 41

b

Answer to Question 42

c

Answer to Question 43

c

Answer to Question 44

d

Answer to Question 45

b
RATIONALE: The other answers are possibilities

Answer to Question 46

c

Answer to Question 47

e

Answer to Question 48

a

Answer to Question 49

b

Answer to Question 50

d

Answer to Question 51

d

Answer to Question 52

a

Answer to Question 53

a

Answer to Question 54

a

Answer to Question 55

b

Answer to Question 56

c

Answer to Question 57

d

Answer to Question 58

a

Answer to Question 59

c

Answer to Question 60

b

Answer to Question 61

c

Answer to Question 62

c

Answer to Question 63

a

Answer to Question 64

b

Answer to Question 65

c

Answer to Question 66

c
RATIONALE: The frequency is higher, but the speed is the same.

Answer to Question 67

a

Answer to Question 68

a

Answer to Question 69

c

Answer to Question 70

a

Answer to Question 71

a

Answer to Question 72

d

Answer to Question 73

d

Answer to Question 74

c

Answer to Question 75

b

Answer to Question 76

d

Answer to Question 77

FALSE

Answer to Question 78

FALSE

Answer to Question 79

TRUE

Answer to Question 80

FALSE

Answer to Question 81

FALSE

Answer to Question 82

FALSE

Answer to Question 83

FALSE

Answer to Question 84

FALSE

Answer to Question 85

TRUE

Answer to Question 86

FALSE

Answer to Question 87

FALSE

Answer to Question 88

TRUE

Answer to Question 89

TRUE

Answer to Question 90

TRUE

Answer to Question 91

TRUE

Answer to Question 92

FALSE

Answer to Question 93

TRUE

Answer to Question 94

FALSE

Answer to Question 95

FALSE

Answer to Question 96

TRUE

Answer to Question 97

TRUE

Answer to Question 98

FALSE

Answer to Question 99

TRUE

Answer to Question 100

FALSE

Answer to Question 101

FALSE

Answer to Question 102

FALSE

Answer to Question 103

TRUE

Answer to Question 104

TRUE

Answer to Question 105

FALSE

Answer to Question 106

TRUE

Answer to Question 107

TRUE

Answer to Question 108

TRUE

Answer to Question 109

TRUE

Answer to Question 110

TRUE

Answer to Question 111

FALSE

Answer to Question 112

FALSE

Answer to Question 113

FALSE

Answer to Question 114

FALSE

Answer to Question 115

TRUE

Answer to Question 116

FALSE

Answer to Question 117

FALSE

Answer to Question 118

22.1