Waves And Sound...

In an orchestra, the musical sounds of different instruments are distinguished from one another on the basis of

If the intensity ratio of two waves is 4 : 1, the ratio of their amplitudes is

Bells are made of metal and not of wood because

For each degree centigrade rise of temperature, the velocity of sound in air increases by

A boy shouts into a deep well and hears the echo 0.4 s after shouting. If the speed of sound is 340 ms^-1, find the depth of water surface from the top of the well.

Speed of sound in air is

Which of the following options is not TRUE about reverberations?

At what temperature, the speed of sound in the air becomes double of its value at 0°C?

This diagram represents displacement- distance graph of a wave travelling in a straight line. The amplitude and the wavelength of this wave respectively, are

A man standing between two parallel cliffs fires a gun. If he hears first and second echoes after 1.5 seconds and 3.5 seconds respectively, then the distance between the two cliffs is (Take velocity of sound in air as 340 m/s).

A man fires a gun and hears an echo from the cliff after 2 seconds. He walks towards the cliff about a distance of 85 m and fires the gun again. He hears an echo after 1.5 seconds. In this case, the velocity of sound in air is

A particle is executing simple harmonic motion. If its amplitude of vibration increases by 20%, then what will be the increase in its total mechanical energy?

A key of a mechanical piano is struck gently and then struck again but much this time. In the second case,

The intensity of sound wave gets reduced by 20% on passing through a slab. The reduction in intensity on passing through two consecutive slabs is:

A spherical source of power 4 W and frequency 800 Hz is emitting sound waves. The intensity of waves at a distance of 200 m is:

The speed of sound in humid air is greater than that in dry air because

Ultrasonic, infrasonic and audible waves travel through a medium with speeds of v_u, v_i and v_a, respectively. Which of the following relations holds true?

What is the change in intensity level when the intensity of a sound increases by a factor of 10⁵?

The speed of sound in hydrogen at STP is v. What is the speed of sound in helium at STP?

In a sinusoidal wave, the time required for a particular point to move from maximum displacement is 0.17 s. Then the frequency of the wave will be