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Intensity of two waves are 9I and I, respectively. Find out the resultant intensity if phase difference between them is π.

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Important Questions on Wave Motion on a String

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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Previous Year Questions)>Q 17
A stretched string with tension 20 N and mass per unit length 5 g cm-1 is vibrating with frequency 20 Hz. Calculate minimum length of string.
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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Previous Year Questions)>Q 19
A string of mass 10 g and length 1 m is stretched between two rigid supports. It vibrates with fundamental note of 50 Hz. The tension in string is,
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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Analytical Questions)>Q 1
Transverse wave of same frequency are generated in two steel wires A and B. The diameter of A is twice of B and the tension in A is half of that in B. The ratio of velocities of waves in A and B is,
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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Analytical Questions)>Q 2

A transverse sinusoidal wave moves along a string in the positive x-direction at a speed of 10 cm s-1. The wavelength of the wave is 0.5 m and its amplitude is 10 cm. At a particular time t, the snapshot of the wave is shown in figure. The velocity of P when its displacement is 5 cm is,

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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Analytical Questions)>Q 3
A sound source of frequency 170 Hz is placed near a wall. A man walking from the source towards the wall finds that there is a periodic rise and fall of sound intensity. If the speed of sound in air is 340 ms-1, the distance (in metre) separating the two adjacent positions of minimum intensity is:
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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Analytical Questions)>Q 4
A vibrator makes 150 cm of a string to vibrate in 6 loops in the longitudinal arrangement when it is stretched by 150 N. The entire length of the string is  then weighed and is found to weigh 400 mg. Then
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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Analytical Questions)>Q 5
The equation of a plane progressive wave is y=0.02sin8πt-x20. When it is reflected at a rarer medium (medium with higher velocity) at x=0, its amplitude becomes 75% of its previous value. The equation of the reflected wave is
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Beta Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise (Analytical Questions)>Q 6
A sonometer wire resonates with a given tuning fork forming standing waves with five antinodes between the two bridges when a mass of 9 kg is suspended from the wire. When this mass is replaced by mass M, the wire resonates with the same tuning fork forming three antinodes for the same positions of the bridges. Then, find the value of square root of M.