Question

Which statement best describes what happens when a sound source is moving? As the sound source approaches the observer, the pitch decreases and continues to do so as it passes the observer. As the sound approaches the observer, the pitch increases; as it passes the observer, the pitch decreases. As the sound source approaches the observer, the pitch decreases; as it passes the observer, the pitch increases. As the sound source approaches the observer, the pitch increases and continues to do so as it passes the observer.

Answer 1

Answer:

As the sound approaches the observer, the pitch increases; as it passes the observer, the pitch decreases.

Explanation:

As we know by the Doppler's effect of sound when sound source is approaching an observer then in that case the frequency of sound is given as

$f' = f_o (\frac{v}{v-v_s})$

so here the frequency of sound is more than the actual frequency

while if the source of sound is passing away from the observer then in that case the frequency of the sound observed by the observer is given as

$f' = f(\frac{v}{v+v_s})$

so here the frequency of the sound observed by the observer is less than the actual frequency

so correct answer will be

As the sound approaches the observer, the pitch increases; as it passes the observer, the pitch decreases.

Answer 2

The answer is B it increases as it goes toward you then decreases after it passes you