Fill in the following blanks with suitable words :
(a) An echo is simply a ___ sound .
(b) Pitch of sound depends on ___ .
(c) Loudness of sound depends on ___ .
(d) Quality of sound depends on ___ .
(e) Echoes are caused by the ___ of sound .
Pitch of a sound depends on its frequency.
Fill in the blanks.
(1) Sound waves need …………….. medium for propagation.
(2) Technique of echocardiography is based on reflecting property of …………….. waves.
(3) Sound produced by vibration of simple pendulum is …………….. sound.
(4) For determination of the depth of the sea …………….. technique is used.
(5) Pitch of a sound depends upon ………………. of wave.