Question

You are jogging along a straight road one day at constant velocity vo when you hear the siren of an ambulance approaching from behind. The frequency you hear is f-756 Hz You stop to take a break and the frequency you hear changes to f2 765 Hz The ambulance then overtakes you and speeds away, and the frequency you hear is f3 680 Hz The speed of sound in air is Vsound 340 m/s and there is no wind. The ambulance is moving at constant velocity Vs, and the frequency of the siren at its source is fo. Answer the following questions. Us 0s Us

1. What is the speed of the ambulance v_s?

2. What is the frequency of the siren at its source f_0?

3. What is your initial speed v_o?

Answer 1

Brief:- This is an example of doppler effect with sound waves. The basic idea here is that, the apparent frequency heard by an observer or a listener changes with motion of both the source and the observer.

The apparent frequency may increase or decrease compared to the actual frequency depending on the direction of motion of source and observer with respect to each other.

Brief: - This is an example of doppler effect with sound waves. The basic idea here is that, the apparent frequency heard by an observer or a listener changes with motion of both the source and the observer. The apparent frequency may increase or decrease compared to the actual frequency depending on the direction of motion of source and observer with respect to each other. \r\n Doppler effect: The change in frequency emitted by source is given by: f'_0 = (v plusminus v_0)/(v plusminus v_s)f_s here: f'_0 = frequency forceived by the observer or Listener f_s = frequency emitted by the source v_0 = velocity of observer v_s = velocity of source. Also: v_s = negative;when source moves towards the observer v_s = positive;when source moves away from observer v_0 = positive;when observer moves towards source. V_0 = negative;when observer moves away from source.] So Let us analyze the situation step-by-step: case 1: when both observer and source are moving in the some direction \r\n Given f_1 =

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