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
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
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
A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has.
Three nodes and three antinodes
Three nodes and four antinodes
Four nodes and three antinodes
Four nodes and four antinodes
Which of the following equation represents a wave?
y = a sin ωt
y = a cos kx
y = a sin (ωt - bx + c)
y = a sin (ωt - kx)
Velocity of sound waves in air is 330 m/s. For a particular sound wave in air, path difference of 40 cm is equivalent to phase difference of 1.6π. The frequency of this wave is.
165Hz
150 Hz
660 Hz
330 Hz
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
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
For production of beats the two sources must have.
Different frequencies and same amplitude
Different frequencies
Different frequencies, same amplitude and same phase
Different frequencies and same phase
Two trains move towards each other with the same speed. The speed of sound is 340 m/s. If the height of the tone of the whistle of one of them heard on the other changes 9/8 times, then the speed of each train should be
20 m/s
2 m/s
200 m/s
2000 m/s
