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JEE 2020 Revision Quiz: Waves

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Question 1

A wire under tension vibrates with a fundamental frequency of 600 Hz. If the length of the wire is doubled, the radius is halved and the wire is made to vibrate under one-ninth the tension. Then the fundamental frequency will become

Question 2

Two waves

and

superimpose to form a resultant wave whose amplitude is

Question 3

Radio waves diffract around building although light waves do not. The reason is that radio waves

Question 4

A train is moving on a straight track with speed 20 ms^–1. It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound = 320 ms^–1) close to :

Question 5

The apparent frequency of sound heard by a listener is 10% more than the actual frequency of the note emitted by the source when the source moves towards the stationary listener with velocity v. When the source moves with a velocity 2v, the apparent frequency will be more than the actual frequency by–

Question 6

A wire under tension vibrates with a frequency of 450 per second. What would be the fundamental frequency if the wire were half as long, twice as thick and under one-fourth tension –

Question 7

A string 1m long is drawn by a 300Hz vibrator attached to its end. The string vibrates in 3 segments. The speed of transverse waves in the string is equal to

Question 8

Two organ pipes, each closed at one end, gives 5 beat per sec, when emitting their fundamental notes. If their lengths are in the ratio of 50 : 51, their fundamental frequencies (in Hz) are-

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May 27JEE & BITSAT