A man claps his hands near a mountain and hears the echo after 4 seconds.If the speed of sound under these conditions be 330 m/s,calculate the distance of the mountain from the man.
660 metres
600 metres
750 metres
570 metres
A pendulum vibrates with a time period of 1 second.The sound produced by it is
supersonic
audible
infrasonic
ultrasonic
Find the time period of a wave whose frequency is 400 MHz?
0.0012 s
0.0025 s
0.0015 s
0.0010 s
Sound propagates through
Solid
Liquid
Gas
All the above
A boat at anchor is rocked by waves whose troughs are 150 m apart and whose velocity is 30 m/s.How often do the crests reach the boat ?
0.2 s
10 s
0.5 s
5s
The velocity of sound in vaccum is :
332 m/s
330 m/s
288 m/s
Zero
The speed of the bob of an oscillating pendulum is zero :
at the mean position
at an extreme position
between the mean position and the left extreme
between the mean position and the right extreme
Periodic vibrations of decreasing amplitude are called
Artificial vibrations
Damped vibrations
Free vibrations
None of these
A sitar player plucks the wire of a sitar. After a short time each part of the wire starts vibrating in a direction perpendicular to the wire. Is the propagation of this disturbance a longitudinal or a transverse wave ?
Longitudinal
Transverse
Stationary
Both longitudinal and transverse
What kind of waves are used in SONAR ?
ultrasonic waves
infrasonic waves
radio waves
audible sound waves
