A whistle revolves in a circle with an angular speed of `20 rad//sec` 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 which is far away from the centre in the same plane? `v=340m//s`

(i) What is beat phenomenon? (ii) A whistle revolves in a circle with angular velocity of omega=20rads^(-1) . If the frequency of sound is 385 Hz and speed is 340 ms^(-1) , then find the frequency heard by the observer when the whistle is at B.

(i) What is beat phenomenon? (ii) A whistle revolves in a circle with angular velocity of omega=20rads^(-1) . If the frequency of sound is 385 Hz and speed is 340 ms^(-1) , then find the frequency heard by the observer when the whistle is at B.

An observer a sitting on a cart executing SHM between A and B listens to a whistle which rotates in a circle with constant speed 5 m/s as shown.The maximum speed of the car is same as that of whistle . If frequency of the whistle is 640 Hz,then maximum possible frequency observed by observer is [Speed of sound in air= 320 m/s]

A disc of radius R is rotating uniformly with angular frequency . A source of sound is fixed to the rim of the disc. The ratio of maximum to minimum frequency heard by a stationary observer, far away from the disc and in the plane of the disc is: (v = speed of sound)