In the diagram below, a stationary source located at point S produces sound having a constant frequency of 512 hertz. Observer A, 50 meters to the left of S, hears a frequency of 512 hertz. Observer B, 100.0 meters to the right of S, hears a frequency lower than 512 hertz.

A) Observer A is stationary, and observer B is moving away from point S.

B) Observer A is stationary, and observer B is moving toward point S.

C) Observer A is moving away from point S, and observer B is stationary.

D) Observer A is moving toward point S, and observer B is stationary.

Question

24-05-2018
Physics

contestada

In the diagram below, a stationary source located at point S produces sound having a constant frequency of 512 hertz. Observer A, 50 meters to the left of S, hears a frequency of 512 hertz. Observer B, 100.0 meters to the right of S, hears a frequency lower than 512 hertz.

A) Observer A is stationary, and observer B is moving away from point S.

B) Observer A is stationary, and observer B is moving toward point S.

C) Observer A is moving away from point S, and observer B is stationary.

D) Observer A is moving toward point S, and observer B is stationary.

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Need help on these, thank you!

Hilltop1108 Hilltop1108 · Answer 1 · 2018-05-24T09:57:31+02:00

This has to do with Doppler effect. If the source or the observer moves, they the observer will hear a different frequency. Since the source is stationary, we only need to know whether the observer is moving.

Since Observer A does not hear a change in frequency, he a must be stationary. So we can ignore C and D

Since Observer B hears a different frequency, Observer B must be moving. Here's the tricky part. We need to find whether B is moving towards or away the source. Since he hears a lower frequency, he is walking away from the source. So the answer is A.

You can conform with the Doppler equation.

Answer: A

jainveenamrata jainveenamrata · Answer 2 · 2022-03-21T14:29:49+01:00

Observer B hears the different frequencies. Then observer A is stationary, and observer B is moving away from point S. Option A is correct.

What is a wave?

A wave is an interference in a medium that brings energy without a net activity of the particle. It may carry the form of elastic deformation, a variation of pressure, etc.

This has to do with the Doppler effect. If the source or the observer moves, then the observer will hear a different frequency. Since the source is stationary, we only need to know whether the observer is moving or not.

Since observer A does not hear a change in frequency, he must be stationary. So we can neglect options C and D.

Since observer B hears a different frequency then observer B must be moving. Here is the tricky part. We need to find whether B is moving towards or away from the source. Since he hears a lower frequency, he is walking away from the source. Hence the correct option is A.

More about the wave link is given below.

https://brainly.com/question/3004869