Two tuning forks X and Y are sounded together producing 10 beats per second, X is in resonance with 30 cm long air column closed at one end and Y is in resonance with 59 cm long air column open at both ends. Frequencies of forks X and Y are

Fundamental frequency of a sonometer wire loaded with a block of mass 1 kg and density 2g/cc is 300 Hz. The block is completely immersed in a liquid of density 1.5g/cc, fundamental frequency now becomes

A train is moving towards a hill with a speed 108 km/hr . The engine of the train blows a whistle of frequency 600 Hz. Speed of sound in air being 330 m/sec, frequency of the reflected sound heard by a passenger sitting in the train will be

A vibrating tuning fork of frequency 333 Hz is moving away from a listener and towards a wall with a uniform speed 3 m/sec. Number of beats heard per second by the listener is approximately (speed of sound in air = 330 m/s)

Two coherent sound sources of intensity ratio 49 : 9 are used in an interference experiment. The ratio of the intensities of the maxima and minima in the interference pattern is

The apparent frequency of a sound wave as heard by an observer is 10 % more than the actual frequency. If the velocity of sound in air is 330 m/s, then

A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz, while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0 kHz while approaching the same siren. The ratio of the velocity of train B to that train A is

There are following four possible relative motions between the source of sound and listener. In which case the Doppler effect is not observed.

When both source and observer moves in the same direction with a velocity equal to half the velocity of sound, the change in frequency of the sound as detected by the observer is

A weight is attached to the free end of a sonometer wire. It gives resonance at a length 40 cm when it is vibrated with a tuning fork of frequency 512. The weight is then immersed wholly in water; the resonant length is reduced to 30 cm. The relative density of weight suspended is

Two notes of wavelengths 2 m and 3 m produce 200 beats per second in a gas. The velocity of sound in the gas is

Intensity of sound X is 3 bel greater than that of Y. Ratio of intensities of X and Y is