4) Consider the two pedestrians standing along the train track again. In this ca

Question

4) Consider the two pedestrians standing along the train track again. In this case, the blowing train whistle has already passed the first pedestrian and is approaching the second pedestrian. (Assume that the train whistle emits sound uniformly BOTH forward AND backward.) At the instant shown below, the blowing whistle is is exactly halfway between the two pedestrians. Pedestrian 1 Pedestrian 2 Which statement is TRUE? "Both hear the same pitch and both hear the same amplitude. "Both hear the same pitch, but Pedestrain 1 hears a higher amplitude than Pedestrian 2." "Both hear the same pitch, but Pedestrain 1 hears a lower amplitude than Pedestrian 2." "Both hear the same amplitude, but Pedestrian 1 hears a higher pitch than Pedestrian 2." "Both hear the same amplitude, but Pedestrain 1 hears a lower pitch than Pedestrian 2."

Explanation / Answer

Correct option :e ( last option)

Explanation :

The change in frequency at different observers is due to Doppler effect.

When the relative speed between source of sound and the observer is high, the frequency will be high. From the figure, the Relative velocity is high between train and pedestrian 2. So ,it will hear a higher frequency. As high frequency means high pitch, the pitch at pedestrian 2 will be high.

And the amplitude will be same

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