Waves Test - 71...

In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristics?

Two waves having sinusoidal waveforms have different wavelengths and different amplitude. They will be having

Intensity level 200 cm from a source of sound is 80 dB. If there is no loss of acoustic power in air and intensity of threshold hearing is 10^–12 Wm^–2 then, what is the intensity level at a distance of 4000 cm from source

In the musical octave `Sa\', \'Re\', \'Ga\'

Learned Indian classical vocalists do not like the accompaniment of a harmonium because

Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns

A hollow pipe of length 0.8 m is closed at one end. At its open end a 0.5 m long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is 50 N and the speed of sound is 320 ms^–1, the mass of the string is

The ends of a stretched wire of length L are fixed at x = 0 and x = L. In one experiment, the displacement of the wire is y₁ = A sin (πx / L) sin ωt and energy is E₁, and in another experiment its displacement is y₂ = A sin (2πx / L) sin 2ωt and energy is E₂. Then

In a large room, a person receives direct sound waves from a source 120 metres away from him. He also receives waves from the same source which reach him, being reflected from the 25 metre high ceiling at a point halfway between them. The two waves interfere constructively for wavelength of