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Waves and Sound question bank (Physics)

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Q1.

A train moves towards a stationary observer with speed $20$ m/s. The train sounds a whistle and its frequency heard by the observer is $f_1$. When the train moves away from the platform at a speed of $20$ m/s, the frequency heard is $f_2$. If the speed of sound is $340$ m/s, then $\dfrac{f_2}{f_1}$ is

(A)

$\dfrac{7}{8}$

(B)

$\dfrac{8}{7}$

(C)

$\dfrac{9}{8}$

(D)

$\dfrac{8}{9}$

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Q2.

In the context of the Doppler effect in sound, which statement is true regarding the wave speed in the medium?

(A)

The speed of sound increases if the source moves towards the observer.

(B)

The speed of sound decreases if the source moves away from the observer

(C)

The speed of sound remains the same regardless of the relative motion between the source and observer.

(D)

The speed of sound changes based on the observer's velocity.

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