« previous next »

Author Question: A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of ... (Read 111 times)

jwb375

  • Hero Member
  • *****
  • Posts: 540
on: Jul 29, 2018
A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of hearing is 1.0  10-12 W/m2. What is the sound intensity level 30.0 m from the source?
 
  A) 92.5 dB
  B) 81.5 dB
  C) 1.77  10-3 dB
  D) 1.77  10-3 W
  E) -27.5 dB

Question 2

When a change of magnetic field occurs in a closed loop of wire,
 
  A) a voltage is induced in the wire.
  B) current is made to flow in the loop of wire.
  C) electromagnetic induction occurs.
  D) all of the above
  E) none of the above


Meganchabluk

  • Sr. Member
  • ****
  • Posts: 301
Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

Awesome job my friend


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

jwb375

  • Hero Member
  • *****
  • Posts: 540
Reply #2 on: Jul 29, 2018
Thank you!


Meganchabluk

  • Sr. Member
  • ****
  • Posts: 301
Reply #3 on: Jul 29, 2018
Always glad to help...


« previous next »
 

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Did you know?

The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Crying Frequency in the Early Months In their first months of life, infants often cry for no appare Crying Frequency in the Early Months In their first months of life, infants often cry for no appare
Two-Point Threshold Device for Measuring Touch Acuity Two-Point Threshold Device for Measuring Touch Acuity
If raising a vehicle without a frame, place the flat pads under the pinch weld seam to spread the ... If raising a vehicle without a frame, place the flat pads under the pinch weld seam to spread the ...
Measles rash. (© Lowell Georgia/Science Source/Photo Researchers, Inc.) Measles rash. (© Lowell Georgia/Science Source/Photo Researchers, Inc.)
(a) A turbidometry detector measures laser light directly across from the light source. The sample, ... (a) A turbidometry detector measures laser light directly across from the light source. The sample, ...
Place a towel or sheet over knee area. Use a thin barrier to protect skin from cold source. Place a towel or sheet over knee area. Use a thin barrier to protect skin from cold source.
Video: Olfaction. or the sense of smell

For a complete list of videos, visit our video library