Question

a source produces 50 crests and 50 troughs in time 0.5 seconds find their frequency.
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Answer 1

Answer:

number of oscillations per second is called frequency.

Explanation:

one crest and I trough make one oscillation .

fifty such oscillations happen in half a second.

Therefore hundred such oscillations will happen in one second.

and as told earlier number of oscillations per second is called frequency ....so

frequency =100Hz

Answer 2

Answer:

well f =100 hz

Explanation:

1 crest +1 trough = 1 wave per sec

50 crest +50 troughs = 100 wave per sec

I know it's a bit late but still I felt confident enough to answer thanks.