A whistle sends out 256 waves in a second. If the whistle approaches the observer with velocity 1/3 of the velocity of sound in air, the number of waves per second the observer will receive

The speed of sound in air at a given temperature is 350 m/ s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity 50 m/s. The apparent frequency in cps heard by the observer will be

A whistle emitting a sound of frequency 450 Hz approaches a stationary observer at a speed of 33 m/s. Velocity of sound is 330 m/s. The frequency heard by the observer, in Hz, is :

Assertion: The whistle of an approaching engine appears to be shriller than that of a receding engine. Reason: This is due to Doppler effect, which states that if a source of sound approaches the observer, the frequency of sound increases and if the source recedes the observer, the frequency of sound decreases.

Two waves of wave length 100 and 101 cm produce 20 beats in 6 seconds in air.Find the velocity of sound in air.

A vehicle sounding a whistle of frequency 256Hz is moving on a straight road,towards a hill with velocity of 10ms^-1 . The number of beats per second observed by a person travelling in the vehicle is (velocity of sound = 300ms^-1