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
The time of reverberation of a room A is one second. What will be the time (in second) of reverberation of a room, having all the dimensions double of those of room A?
2
4
1
A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of sound in a tissue is 1.7 km/s. The wavelength of sound in tissue is close to:
4 x 10-4 m
8 x 10-4 m
4 x 10-3 m
8 x 10-3 m
The equation of a sound wave is given as y = 0.005 sin (62.4x + 316t). The wavelength of this wave is:
0.4 unit
0.3 unit
0.2 unit
0.1 unit
Which one of the following statements is true?
Both light and sound waves in air are transverse
The sound waves in air are longitudinal while the light waves are transverse
Both light and sound waves in air are longitudinal
Both light and sound waves can travel in vacuum
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
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
From a wave equation
the frequency of the wave is:
15 Hz
20 Hz
25 Hz
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 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
