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 m/s
3.148 x 105 m/s
2.847 x 105 m/s
3.84 x 10-5 m/s
What kind of waves are used in SONAR ?
ultrasonic waves
infrasonic waves
radio waves
audible sound waves
A pendulum vibrates with a time period of 1 second.The sound produced by it is
supersonic
audible
infrasonic
ultrasonic
Longitudinal waves cannot travel through :
vacuum
solids
liquids
gases
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 swing on which child sits is an example of
Inertia
Momentum
Resonance
Amplitude
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
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 stone is dropped into a well,44.1 metres deep.The sound of the splash is heard 3.13 seconds after the stone is dropped.Find the velocity of sound in air.
339.2 m/s
350 m/s
258.3 m/s
450 m/s
The velocity of sound in vaccum is :
332 m/s
330 m/s
288 m/s
Zero
