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
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
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
Two successive antinodes are separated by a distance equal to
λ/4
λ/2
λ/6
λ
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
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
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
When an external periodic force is applied, a body does not vibrate with its
Artificial vibrations
Natural oscillations
Free vibrations
Damped vibrations
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