What is the effect of humidity on sound waves when humidity increases?
Speed of sound wave increases
Speed of sound decreases
Speed of sound waves remains same
Speed of sound waves becomes zero.
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
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
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 10cm from the fixed end of the string. The speed of incident (and reflected) wave are
5 m/s
10 m/s
40 m/s
The transverse wave represented by the equation y = 4 sin π/6 sin (3x - 15t) has
Amplitude = 4π
Wavelength = 4π/3
Speed of propagation = 5
Period = π/15
A stretched string resonates with tuning fork frequency 512 Hz when length of the string is 0.5m. The length of the string required to vibrate resonantly with a tuning fork of frequency 256 Hz would be.
0.25m
0.5m
1m
2m
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
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
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)
