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
In SONAR we use
ultrasonic waves
infrasonic waves
radio waves
audible sound waves
Sound propagates through
Solid
Liquid
Gas
All the above
Find the time period of a wave whose frequency is 400 MHz?
0.0012 s
0.0025 s
0.0015 s
0.0010 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
S.I unit of wave length (λ) is
centimetre
millimetre
killometre
metre
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
The velocity of sound in vacuum is
332 m/s
330 m/s
288 m/s
0
A sound wave has a frequency of 1000 Hz and a wave length of 34 cm.How long will it take to travel 1 km?
3.20 s
2.94 s
5.94 s
3.10 s
