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 propogation of this disturbance a longitudinal or a transverse wave?
Longitudinal
Transverse
Stationary
Both longitudinal and transvers
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 simple pendulum has a metal bob which is negatively charged.If it is allowed to oscillate above a positively charged metallic plate then its time period will
increase
decrease
remain the same
become zero
A bat can hear sound at frequencies upto 120 kHz.Determine the wavelength of sound in air at this frequency.Take the speed of sound in air as 344 m/s
2.9 x 10-3 m
4.5 x 10-3 m
2.5 x 10-3 m
1.8 x 10-3 m
Delhi Radio Station transmits musical programmes at 219 m wavelength and 1300 Hz frequency.Calculate the velocity of radio waves.
2.847 x 10-5
3.148 x 105
2.847 x 105
3.84 x 10-5
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
5 s
An object moving at a speed greater than that of sound is said to be moving at:
ultrasonic speed
sonic speed
infrasonic speed
supersonic speed
The bob of a pendulum moves from the mean position to an extreme position in 0.28 seconds.Then the time period of the pendulum is
2.24 seconds
1.12 seconds
0.84 seconds
3.84 seconds
Find the time period of a wave whose frequency is 400 MHz?
0.0012 s
0.0025 s
0.0015 s
0.0010 s
A pendulum vibrates with a time period of 1 second.The sound produced by it is
supersonic
audible
infrasonic
ultrasonic