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Class XI Physics Waves 3

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Question 1

Disturbances of two waves are shown as a function of time in the following figure. The ratio of their intensities will be when the ratio of their amplitudes is 1:2

Question 2

A wave travelling along the x-axis is described by the equation y (x, t) = 0.005 cos (αx - βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are

Question 3

Two SHMs are given by

. The phase difference between there after 2 sec.

Question 4

A source at rest sends sound waves of constant wavelength. A wall moves towards the source with a velocity of 33 cm/s. The velocity of sound in the medium is 330 m/s. What is the percentage change in wavelength of sound after reflection from the wall–

Question 5

A standing wave is produced on a string clamped at one end free at the other. The length of the string–

Question 6

Two tuning forks, A and B, produce notes of frequencies 258 Hz and 262 Hz. An unknown note sounded with A produces certain beats. When the same note is sounded with B, the beat frequency gets doubled. The unknown frequency is

Question 7

Sound waves of frequency 600 Hz fall normally on a perfectly reflecting. Wall. The distance from the wall at which the air particles have the maximum amplitude of vibration is (speed of sound in air = 330 ms).

Question 8

Two waves

and

superimpose to form a resultant wave whose amplitude is

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Jul 21JEE & BITSAT