Question

2. A whistle revolves in a circle with angular speed
0 = 20 rad/s using a string of length 50 cm. If the
frequency of sound from the whistle is 385 Hz,
then what is the minimum frequency heard by an
observer who is far away from the centre
(sound = 340 m/s)?
(1) 385 Hz
(2) 374 Hz
394 Hz
(4) 333 Hz​

Answer 1

Answer:

2) 374 Hz

this may help u....

...

Answer 2

Answer:

as we know v= r* omega

therefore

v= 20*0.5=10 m/ sec

acc to Doppler theory for the person far from him will be