A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4 ms^-1 at an angle of 60^o with the source observer is at rest. the apparent frequency observed by the observer (velocity of sound in air 330 ms^-1) is 

• 100 Hz

• 103 Hz

• 106 Hz

• 97 Hz

A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hr. He finds that traffic has eased and a car moving ahead of him at 18 km/hr is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be,

• 1332 Hz

• 1372 Hz

• 1412 Hz

• 1454 Hz

A train moving t a speed of 220 ms^-1 towards a stationary object. emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is
(speed of sound in air is 330 ms^-1)

• 3500 Hz

• 4000 Hz

• 5000 Hz

• 3000 Hz

A transverse wave os represented by y = A sin (ωt - kx). For what value of the wavelength is the wave velocity equal to the maximum particle velocity?

• π A /2

•  π A

• 2πA

• A

A transverse wave propagating along x-axis is represented by:


where x is in metres and t is in seconds. The speed of the wave is

•  m/s
• 
• 

• 8 m/s