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Class XI Physics Waves 5

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Question 1

An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light=3×10⁸ ms^-1)

Question 2

A train moving at 25 m/s emits a whistle of frequency 200 Hz. If the speed of sound in air is 340 m/s, find the frequency observed by a stationary observer.
(i) if observer is in front of the source
(ii) if observer is behind the train

Question 3

A person standing between two parallel hills fires a gun. He hears the first echo after 1.5 s and second after 2.5 s. If the speed of sound is 332 m/s calculate the distance between the hills.

Question 4

An equation y = acos²

represents a wave with-

Question 5

A simple harmonic wave having an amplitude A and time-period T is represented by the equation, y = 5 sin π(t + 4) meter. Then the values of A (in meter) and T (in second) are-

Question 6

Velocity of sound in a gas is proportional to-

Question 7

A string of length 2x is streched by 0.1x and the velocity of transverse wave along it is v. When it is streched by 0.4x, the velocity of the wave is-

Question 8

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 –

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Feb 26JEE & BITSAT