A person is sitting 200 metres away from a 20- Hz sound source. The time interval at which successive compression pulses from the source reach him is k × 10–2 sec. Where ‘k’ is

A boy is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. The time interval between successive compression from the source is:2 sec     7 sec7 sec0.002 sec

Frequency of a wave travelling from source to receiver is 200 Hz. If the speed of sound wave is 100 m/s.Time period of wave is;

22 The warning signal on an ambulance has a frequency of 600 Hz. The speed of sound is 330 m s –1.The ambulance is travelling with a constant velocity of 25 m s –1 towards an observer. Theambulance passes, and then moves away from the observer with no change in velocity.initial positionof ambulancefinal positionof ambulanceobserverWhich overall change in observed frequency takes place between the times at which theambulance is a long way behind the observer and when it is a long way in front of the observer?A 49 Hz B 84 Hz C 91 Hz D 98 Hz

A man generates a symmetrical pulse in a string by moving his hand up and down. At t = 0, the point in his hand moves upward passing through mean position. The pulse travels with speed of 3 m/s on the string & his hands passes 6 times in each second from the mean position. Then the point on the string at a distance 3 m will reach its upper extreme first time at time :- 1.25 sec. 1 sec  sec.none

The distance travelled by a pulse per unit of time is called:A Time period B Pulse speed C Wavelength D Frequency