A train passes a stationary observer. Which of
the following best describes how the amplitude
and the apparent frequency of the sound waves
heard by the observer change as the train moves
away?

As we know that by Doppler's effect of sound we have a formula of apparent frequency observed by the stationary observer when the source is coming closer to it is given by

[tex]f_{app}=f_0(\dfrac{V}{V-V_o})[/tex]

Now when the source will come closer to the stationary observer the apparent frequency observed by the observer will be greater than the actual frequency heard by the driver

now we also know that the formula for wavelength is given by

[tex]\lambda=\dfrac{V}{f}[/tex]

so here the wavelength will be smaller by that observer as the frequency will be more.

so the observer will experience the higher frequency and shorter wavelength of the sound of a train.

To know more about the Dopplers effect follow

https://brainly.com/question/1330077

A train passes a stationary observer. Which of the following best describes how the amplitude and the apparent frequency of the sound waves heard by the observer change as the train moves away?

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What is the dopplers effect?

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A train passes a stationary observer. Which of
the following best describes how the amplitude
and the apparent frequency of the sound waves
heard by the observer change as the train moves
away?