a source of wave produced 40 crest and 40 throughs in 0.4second . find the frequency of the wave.
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A source of wave produced 40 crest & 40 troughs that means it produced 40 wavelengths in 0.4 sec.
=> the no. of wavelengths produced by the source= 40/0.4 = 100
therefore frequency = 100 nu
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