Physics
On sending an ultrasonic wave from a ship towards the bottom of a sea, the time interval between sending the wave and receiving it back is found to be 1.5 s. If the velocity of the wave in sea water is 1400 ms-1, find the depth of sea.
Related Questions
A person standing between two vertical cliffs produces a sound. Two successive echoes are heard at 4s and 6s. Calculate the distance between the cliffs.
(Speed of sound in air = 320 ms-1)
[HINT — First echo will be heard from the nearer cliff and the second echo from the farther cliff.]
A person standing at a distance x in front of a cliff fires a gun. Another person B standing behind the person A at a distance y from the cliff hears two sounds of the fired shot after 2 s and 3 s respectively. Calculate x and y (take speed of sound 320 ms-1)
Figure below shows the distance-displacement graph of two waves A and B. Compare (i) the amplitude, (ii) the wavelength of the two waves.
The period (or frequency) of natural vibrations depends on :
- shape
- size
- external force
- both (1) and (2)