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The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20cm, the length of the open organ pipe is

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 19.4-1 ms at an angle of 60° with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 330 ms-1) is

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330 ms-1)

In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170 second. The frequency of the wave is

The velocity of sound is u, in air. If the density of air is increased to 4 times, then the new velocity of sound will be

A boat at anchor is rocked by waves whose crests are 100 m apart and velocity is 25 m/sec. The boat bounces up once in every

The function sin² (ωt) represents

The equation of a sound wave is y=0.0015sin (62.4x+316t). The wavelength of this wave is

The equation of a transverse wave travelling on a rope is given by y=10sinπ (0.01x-2.00t) where y and x are in cm and t in seconds. The maximum transverse speed of a particle in the rope is about

An organ pipe is closed at one end has fundamental frequency of 1500 Hz. The maximum number of overtones generated by this pipe which a normal person can hear is

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