What does the person in back of the ambulance experience? a) a lower frequency of the siren b) a lower amplitude of the siren c) a higher frequency of the siren eliminate d) a higher amplitude of the siren

The answer to your question is "A. a lower frequency of the siren.

Because the person in back of the ambulance will hear a lower frequency of the siren. This is because the waves are stretched out. A longer wavelength results in a lower frequency.

The correct answer is A.

Explanation:

When there is a relative motion between the source and the observer then there will be change in the frequency or wavelength of the wave. This phenomenon is called Doppler effect.

For example, when the source and the observer are moving away from other then the frequency decreases in this case.

In the given problem, the person is in the back of the ambulance. In this case, the person in the back of the ambulance will listen a lower frequency of the wave. There will be longer wavelength.

Therefore, the correct answer is A.