A person carrying a whistle emitting continuously a note of `272 Hz` is runnig towards a reflecting surface with a speed of `18km//h`. The speed of sound in air is `345ms^(-1)` The number of beats heard by him is

A person with vibrating tuning fork of frequency 338Hz is moving towards a vertical wall with a speed of 2 ms^(-1) . Velocity of sound in air is 340 ms^(-1) . The number of beats heard by that person per second is

A person with vibrating tuning fork of frequency 338 Hz is moving towards a vertical wall with speed of 2 ms^(-1) Velocity of sound in air is 340 ms^(-1) The number of beats heard per second is

A fire whistle emits a tone of 170 Hz. Take the speed of sound in air to be 340 m/s. The wavelength of this sound is about

A bus is moving with a velocity of 5 ms^(-1) towards a huge wall. The drive sounds a horn of frequency 165Hz. If the speed of sound in air is 335 m//s, the number of beats heard per second by a passenger on the bus will be

There is a source of sound (a tuning fork) moving towards a reflecting wall will a speed of 30 ms^(-1) . The velocity of the sound in air is 330 ms^(-1) and the frequency of the tuning fork is 600 Hz. The observer is between the source and the wall and is moving with some velocity V_(1) towards the wall. The beat frequency heard by the observer is 4 Hz. If the tuning fork is waxed, the frequency beats heard by the observer becomes 3 Hz. If the new frequency of tuning fork is k then k//50 is