A sound wave of wavelength λ travels towards the right horizontally with a velocity v. It strikes and reflects from a vertical plane surface, travelling at a speed v towards the left. The number of positive crests striking in a time interval of three seconds on the wall is:
The relative velocity of sound waves with respect to the walls is V + v. Hence, the apparent frequency of the waves striking the surface of the wall is (V + v)/λ. The number of positive crests striking per second is the same as frequency. In three seconds, the number is [3(V + v)]/ λ.
A wave represented by the equation is superimposed on another wave to form a stationary wave such that the point x = 0 is a node. The equation for the other wave is:
The amplitude of a wave disturbance propagating in the positive x-direction is given by at time t = 0 and by at t = 2 seconds, where x and y are in metres. The shape of the wave disturbance does not change during the propagation. The velocity of the wave is:
A uniform rope of mass 6 kg hangs vertically from a rigid support. A block of mass 2 kg is attached to the free end of the rope. A transverse pulse of wavelength 0.06 m is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top is (in m):
A tuning fork of frequency 256 Hz is excited and held at the mouth of a resonance column of frequency 254 Hz. Choose the correct statement:
A man facing a wall holds a tuning fork of frequency 256 Hz between himself and a vertical wall. He moves the tuning fork towards the wall with a velocity 1/100 of the velocity of sound. The number of beats heard per minute would be:
In a good tuning fork:
A flat horizontal platform moves up and down in SHM with an amplitude of 1 cm. A small object is placed on the platform. What is the maximum frequency the platform can have, if the object is not to separate from it during any part of motion?
When a tuning fork is vibrating, the vibrations of the two prongs:
One of the prongs of a tuning fork is broken. The intensity of sound produced by it will:
A tuning fork is set into vibrations and then it is held with its stem resting on a table. How will the duration of its vibrations be affected?