In progressive waves, distance between successive crests or troughs is
λ/4
λ/2
λ
3λ/2
A wave source produces 20 crests and 20 troughs in 0.2 seconds. Find the frequency of the wave.
200 Hz
500 Hz
100 Hz
300 Hz
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
When an external periodic force is applied, a body does not vibrate with its
Artificial vibrations
Natural oscillations
Free vibrations
Damped vibrations
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
A longitudinal wave travels from east to west in air.In which direction do the particles of air move?
East to west
West to east
North to south
South to north
A load suspended from a spring when pulled and released also starts vibrating with certain
Amplitude
Frequency
Force
Velocity
Two successive antinodes are separated by a distance equal to
λ/6
When a body executes vibrations under the action of an external periodic force, then the vibrations of the body are called
Forced vibrations
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
