An ambulance withits siren sounding is standing in heavy traffic. A pedestrian notices that althoughthe loudness of he sound produced doest not change its pitch varies. which option in the following is rsponsible for change n its pitch?
(a) constant,varying (b) constant constant
(c) varying, constant (d) varying,varying
Please only expert answer this.
Dear Student,
Here the ambulance is acting as the source (stationary) and the pedestrian is the listener/observer(moving). Now when the observer is moving towards the source he/she measures higher frequency and when moving away from the source he/she measures lower frequency .
This is the main reason that the observer has observed that though the loudness of the sound produced does not change but the pitch or the frequency of the sound is varying.
So here option (d) is correct .
Regards
Here the ambulance is acting as the source (stationary) and the pedestrian is the listener/observer(moving). Now when the observer is moving towards the source he/she measures higher frequency and when moving away from the source he/she measures lower frequency .
This is the main reason that the observer has observed that though the loudness of the sound produced does not change but the pitch or the frequency of the sound is varying.
So here option (d) is correct .
Regards