Answer:
(a) Frequency The number of waves produced per second is
called the frequency of the wave.
(b) 20 Hz to 20 kHz
(c) (i) Since the distance between a crest and next trough
is Therefore cm
(Given) cm or 1 m
(ii) Distance covered in 20 crests = 20 x 1 = 20
Velocity of the wave,
or
1 crest and 1 trough = 1 wave
20 crest and 20 trough = 20
waves
Frequency
(iii) Time period ,
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