The driver of bus approaching a big wall notices that the frequency of his bus's horn changes from $420\mathrm{H}\mathrm{z}$ to $490\mathrm{H}\mathrm{z}$ when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is $330{\mathrm{m}\mathrm{s}}^{-1}$  :

In an experiment to determine the velocity of sound in air at room temperature using a resonance tube, the first resonance is observed when the air column has a length of 20.0 cm for a tuning form of frequency 400 Hz is used. The velocity of the sound at room temperature is 336 ms^-1. The third resonance is observed when the air column has a length of ____________cm.

A source of sound S is moving with a velocity of 50 m/s towards a stationary observer. The observer measures the frequency of the source as 1000 Hz. What will be the apparent frequency (in Hz) of the source when it is moving away from the observer after crossing him? (Take speed of sound in air as 350 m/s)

A longitudinal wave is represented by x = 10 sin 2p $\left(nt-\frac{x}{\lambda }\right)cm.$  The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal to:

A transverse wave s represented by y = $2sin\left(\omega t-kx\right)cm.$ The value of wavelength (in cm) for which the wave velocity becomes equal to the maximum particle velocity. Will be:

For a transverse wave traveling along a straight line, the distance between two peaks (crests) is 5
 , while the distance between one crest and one trough is 1.5 m. The possible wavelengths (in $\mathrm{A}\to \mathrm{I}\mathrm{V};\mathrm{}\mathrm{B}\to \mathrm{I}$ ) of the waves are: