The wave described by

        y = 0.25 sin (10πx - 2πt),

where x and y are in metre and t in second, is a wave travelling along the

A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The speed of incident ( and reflected) wave are :

A wave in a string has an amplitude of 2cm. The wave travels in the +ve direction of x axis with a speed of 128 ms^-1 and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is:

The driver of a car travelling with speed 30 ms-1 towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 ms^-1, the frequency of reflected sound as heard by driver is:

A whistle revolves in a circle with angular velocity ω = 20 rad/s using a string of length 50 cm. If the actual frequency of sound from the whistle is 385 Hz, then minimum frequency heard by the observer far away from the centre will be:(velocity of sound v = 340 m/s)

A pointer source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is:

Two trains move towards each other with the same speed. The speed of sound is 340 m/s. If the height of the tone of the whistle of one of them heard on the other changes times, then the speed of each train should be:

Standing waves are produced in a 10m long stretched string. If  the string vibrates in 5 segments and the wave velocity is 20 m/s, the frequency is:

An observer moves towards a stationary source of sound with a speed th of the speed of sound. The wavelength and frequency of the source emitted are λ and ƒ respectively. The apparent frequency and wavelength recorded by the observer are respectively will be:

The time of reverberation of a room A is one second. What will be the time (in second) of reverberation of a room, having all the dimensions double of those of room A?