You hear the siren on an ambulance off in the distance. If the pitch is lower...
You hear the siren on an ambulance off in the distance. If the pitch is lower than it would be normally, what can you conclude about the motion of the ambulance?
a. the ambulance is moving away from you.
b. the ambulance is moving towards you.
c. the ambulance is not moving at all relative to you.
d. we cannot determine if the ambulance is moving without also knowing the wavelength of the sound waves.
Homework Answers
As we know that a high pitch sound corresponds to a high frequencysound wave and a low pitch sound corresponds to a low frequency sound wave.
As per the doppler effect, if the frequency is increasing, the source is coming closer to the observer.
So coming to our question,
Since here the pitch has been decreased then the ambulance is moving away from the observer that means "me". So 'a' is true.
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