LMS

The ratio of frequencies in a stretched string is:

In a stationary wave the distance between consecutive antinodes is 25 cm. If the wave velocity is 300 m/s, then the frequency of wave will be

Sonar is used to detect

Doppler shift in frequency does not depend upon

Four wires of identical lengths, diameters and materials are stretched on a sonometer box. The ratio of their tensions is 1 : 4 : 9 : 16. The ratio of their fundamental frequencies is

A pipe closed at one end has length 50cm, the wavelength of first harmonic will be:

When the source of sound moves towards the stationary observer, the value of apparent frequency ‘fo’ is:

With what speed an observer should move towards a stationary source such that apparent frequency is double the actual frequency (v is speed of sound waves)

A sitar wire vibrates with frequency of 330 vibrations per second. If its length is increased three times and tension is increased four times then the frequency of the wire will be

When both source and listener move in the same direction with a velocity equal to half the velocity of sound, the change in frequency of the sound as detected by the listener is:

Which of the following gives three regions of the electromagnetic spectrum in order of increasing wavelength?

When a wave moves through 10m, a point changes from crest to trough and time taken is 1s then wavelength of wave and its frequency are

A closed organ pipe has fundamental frequency 100 Hz. What frequencies will be produced if its other end is also opened?

An observer approaches a stationary 1000 Hz sound source twice the speed of sound. What frequency does the observer hear?

Fundamental frequency of an open pipe of length 0.5 m is equal to the frequency of the first overtone of a closed pipe of length l. The value of lc is (m)

In which of the following, Doppler’s effect is not applicable?

The phase difference between the particles vibrating at two consecutive nodes is:

The wavelength of the sound produced by a source is 0.8m. If the source moves towards the stationary listener at 32 m/s, what will be apparent wavelength of the sound? The velocity of sound is 320 m/s.

A source of sound moves towards a stationary listener with half of the velocity of sound. If the actual frequency of the sound produced by the source be f, then change in frequency will be:

Sonar is used to detect

Which waves are longitudinal?

A wall poster showing the electromagnetic spectrum is displayed in a laboratory. A section of the electromagnetic spectrum has been accidentally ripped from this wall poster. Which piece is missing?

The essential properties of a medium for the propagation of mechanical waves are

What is the ratio of velocity to fundamental frequency for a closed organ pipe of length l ?

When an aero plane move towards air port, then the frequency of reflected wave from the aeroplane received by radar

An observer moves towards a stationary source of sound, with a velocity one fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

A set of frequencies which are multiples of the fundamental frequency are called

The stationary waves consist of

For same mass of length if tension of a vibrating string is increased by four times then speed of wave increases by:

A pipe has a length of 1m. Determine the frequencies of the fundamental and the first two harmonics if the pipe is open at both ends

An observer move with velocity ‘vo’ toward a stationary source, then the number waves received in one second is (v is speed of sound):

If a train of waves moving along a rope has a velocity of 100m/s and a wavelength of 20m, then the time period is:

At open end of organ pipe

Stationary waves of fundamental frequency 50 Hz are produced in an organ pipe closed at one end. The distance between a node and anti-node is (velocity of sound = 300 m/s)

The length of a string is 1m, tension in it is 40N and mass of the string is 0.1 kg. Then the velocity of transverse waves produced in the string will be:

If velocity of sound in air be 350 m/s, then the fundamental frequency of an open pipe of length 100 cm is:

Two waves having same frequency travelling along same line in opposite direction, will produce

Radio waves of wavelength l are sent from RADAR towards an aeroplane. If the aeroplane is moving towards the RADAR station, the wavelength of the radio waves received after reflection from the aeroplane will be

An observer is moving towards a stationary source with a speed one fifth of the speed of sound. The frequency of sound heard by the observer will be if v is the speed and f is the original frequency of the sound waves

Stationary wave is produced in a string fixed at its both ends. When oscillating in its 4th mode with wavelength the length of string would be.

The figure shows circular motion of a reference particle to represent simple harmonic motion. The amplitude of simple harmonic motion is

A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer in Hz is (speed of sound = 330 m/s)

Shock waves are produced by objects

The velocity of sound in any gas depends upon

Newton assumed that sound propagation in a gas taken place under

When a wave reflects from the boundary of denser medium, then in the reflected wave there will be

Beats is an application of

When water waves pores from deep water into shallow water how do the frequency, wave length and speed change

Two wave of same frequency traveling in opposite direction give

The frequency of sound is ‘f’ and velocity is ‘v’. If frequency is doubled then velocity