A crest of a water wave travels 80 cm in 4 s. If
the distance between 2 successive crests is
4 mm, what is the frequency of the wave ?
(1) 100 Hz (2) 50 Hz (3) 32 Hz (4) 64 Hz
A cell converts :
(1) Electrical energy into chemical energy
3.
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The answer is 50 HZ
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