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Author Question: A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source ... (Read 42 times)

Sportsfan2111

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on: Jul 28, 2018
A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00  108 m/s)
 a. 33.3  10-6 s
  c. 66.7  10-6 s
  b. 133  10-6 s
  d. 0.0333  10-6 s

Question 2

A 500-Hz whistle is moved toward a listener at a speed of 10.0 m/s. At the same time, the listener moves at a speed of 20.0 m/s in a direction toward the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.)
 a. 473 Hz
  c. 533 Hz
  b. 485 Hz
  d. 545 Hz


alexisweber49

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Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

D


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Sportsfan2111

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Reply #2 on: Jul 28, 2018
TY


alexisweber49

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Reply #3 on: Jul 28, 2018
You're welcome


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