Question

A source produces 15 crests and 15 troughs in 3 sec .when the second crest is produced, the first is 2 cm away from the source. calculate

i-frequency
ii-wavelength
iii-speed of the wave ?

Answer 1

frequency=f==15/3=5

wavelenght=X=2  (distance between 2 crests is called wavelenght)

speed=f*v

=5*2

=10cm/sec

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