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Author Question: A plane flies toward a stationary siren at 1/4 the speed of sound. Then the plane stands still on ... (Read 102 times)

jessicacav

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on: Jul 29, 2018
A plane flies toward a stationary siren at 1/4 the speed of sound. Then the plane stands still on the ground and the siren is driven toward it at 1/4 the speed of sound.
 
  In both cases, a person sitting in the plane will hear the same frequency of sound from the siren. A) True
  B) False

Question 2

A stationary siren emits sound of frequency 1000 Hz and wavelength 0.343 m. An observer who is moving toward the siren will measure a frequency f and wavelength  for this sound such that
 
  A) f > 1000 Hz and  > 0.343 m.
  B) f > 1000 Hz and  = 0.343 m.
  C) f > 1000 Hz and  < 0.343 m.
  D) f = 1000 Hz and  < 0.343 m.


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ryansturges

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Reply #1 on: Jul 29, 2018
Answer to Question 1

This forum is amazing.

Answer to Question 2

B


jessicacav

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Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

Jossy

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Reply 3 on: Yesterday
Wow, this really help

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