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
Standing waves are produced in a 10m long stretched string. If the string vibrates in 5 segments and the wave velocity is 20 m/s, the frequency is:
10 Hz
5 Hz
4 Hz
2 Hz
A star which is emitting radiation at a wavelength of 5000Å is approaching the earth with a velocity of 1.50 × 106 m/s. The change in wavelength of the radiation as received on the earth is:
0.25Å
2.5Å
25Å
250Å
With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are:
Energy, momentum and mass
Energy
Energy and mass
Energy and linear momentum
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
Equation of progressive wave is given by
Then which of the following is correct?
v = 5 cm
λ = 18 cm
a = 0.04 cm
ƒ = 50 Hz
A stretched string resonates with tuning fork frequency 512 Hz when length of the string is 0.5 m. The length of the string required to vibrate resonantly with a tuning fork of frequency 256 Hz would be:
0.25 m
0.5 m
1 m
2 m
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
A plus of wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with :
A phase change of 180° with velocity reversed
The same phase as the incident pulse with no reversal of velocity
A phase change of 180° with no reversal of velocity
The same phase as the incident pulse, but with velocity reversed
A standing wave is represented by y = a sin (100t) cos(0.01)x, where y and a are in millimetre, t in second and x is in metre. Velocity of wave is:
104 m/s
1 m/s
10-4 m/s
Not derivable from above data