A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The speed of incident ( and reflected) wave are:
5 m/s
10 m/s
20 m/s
40 m/s
Two waves of same frequency and intensity superimpose on each other in opposite phases. After the superposition, the intensity and frequency of waves will:
Increase
Decrease
Remain constant
Become zero
In a sinusoidal wave, the time required for a particular point, to move from maximum displacement to zero displacement is 0.170 s. The frequency of the wave is:
1.47 Hz
0.36 Hz
0.73 Hz
2.94 Hz
The speed of a wave in a medium is 760 m/s. If 3600 waves are passing through a point in the medium in 2 min, then their wavelength is:
13.8 m
25.3 m
41.5 m
57.2 m
An observer moves towards a stationary source of sound with a speed th of the speed of sound. The wavelength and frequency of the source emitted are λ and ƒ respectively. The apparent frequency and wavelength recorded by the observer are respectively:
ƒ, 1.2λ
0.8ƒ, 0.8λ
1.2ƒ, 1.2λ
1.2ƒ, λ
The velocity of sound in any gas depends upon:
Wavelength of sound only
Density and elasticity of gas
Intensity of sound waves only
Amplitude and frequency of sound
Two waves are said to be coherent, if they have:
Same phase but different amplitude
Same frequency but different amplitude
Same frequency, phase and amplitude
Different frequency, phase and amplitude
A cylindrical resonance tube open at both ends, has a fundamental frequency ƒ, in air. If half of the length is dipped vertically in water, the fundamental frequency of the air column will be:
2ƒ
ƒ
Two sound waves with wavelengths 5.0 m and 5.5 m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second:
12
zero
1
6
A transverse wave is represented by the equation
For what value of λ is the maximum particle velocity equal to two times the wave velocity?
λ = 2 π y0
λ = π y0