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
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 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 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 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
Longitudinal waves cannot travel through
vacuum
solids
liquids
gases
The velocity of sound in vacuum is
332 m/s
330 m/s
288 m/s
0
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
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 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
