The frequency of sinusoidal wave, 0.40 cos (2000t + 0.80) would be
1000π Hz
2000 Hz
20 Hz
1000/π Hz
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 × 10-4m
8 × 10-4m
4 × 10-3m
8 × 10-3m
From a wave equation
y = 0.5 sin 2π/3.2 (64t - x),
the frequency of the wave is
5 Hz
16 Hz
25 Hz
A star which is emitting radiation at a wavelength of 5000 Å 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
0.25 Å
2.5 Å
25 Å
250 Å
With the propagation of a longitudinal wave through a meterial medium, the quantities transmitted in the propagation direction are
Energy, momentum and mass
Energy
Energy and mass
Energy and linear momentum
The speed of a wave in a medium is 760 m/s. If 3600 waves are passing througha point in the medium in 2 min, then their wavelength is
13.8 m
25.3 m
41.5 m
57.2m
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 standing wave is represented by y = a sin (100t) cos (0.01)x, is in metre. velocity of wave is
104m/s
1 m/s
10-4 m/s
Not derivable from above data
A 5.5m length of string has a mass of 0.035 kg. If the tension in the string is 77N, the speed of a wave on the string is
110ms-1
165 ms-1
77 ms-1
102 ms-1
