EASY
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IMPORTANT
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Two waves of frequencies 50 Hz and 45 Hz are produced simultaneously, then the time interval between successive maxima of the resulting wave is [Maxima refers to the maximum intensity]

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Important Questions on Waves

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JEE Main/Advance
IMPORTANT
A set of 10 tuning forks is arranged in series of increasing frequency. If each fork gives 3 beats with the preceding one and the last fork has twice the frequency of the first, then frequency of the first tuning fork is
EASY
JEE Main/Advance
IMPORTANT
The displacement at a point due to two waves are given by y1=2 sin (50πt) and y2=3 sin (58πt). Number of beats produced per second is
EASY
JEE Main/Advance
IMPORTANT
A tuning fork of unknown frequency produces 4 beats per second when sounded with another tuning fork of frequency 254 Hz. It gives the same number of beats per second when unknown tuning fork loaded with wax. The unknown frequency before loading with wax is
HARD
JEE Main/Advance
IMPORTANT
A listener and a source of sound are moving with the same speed in the same direction. The ratio of the frequency of the source and the frequency which is heard by the listener is
EASY
JEE Main/Advance
IMPORTANT
A man standing on a platform observes that the frequency of the sound of a whistle emitted by a train drops by 140 Hz. If the velocity of sound in air is 330 m s-1 and the speed of the train is 70 m s-1, the frequency of the whistle is
EASY
JEE Main/Advance
IMPORTANT

A whistle 'S' of frequency ν revolves in a circle of radius R at a constant speed v. What is the ratio of the largest and smallest frequency detected by a detector D, at rest, at a distance 2 R from the centre of the circle as shown in the figure? (take speed of sound in air as C)

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JEE Main/Advance
IMPORTANT

A source of sound of frequency f1 is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f( Hz) is plotted against time t (s). The speed of sound in air is 300 m s-1. Find f1g=10 m s-2.

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HARD
JEE Main/Advance
IMPORTANT
A whistle of frequency 500 Hz tied to the end of a string of length 1.2 m revolves at 400 rev min-1. A listener standing some distance away in the plane of rotation of whistle hears frequencies in the range. Speed of sound =340 m s-1.