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1. A source of wave produces 20 crestsand 20 troughs in 0.2 sec. Find thefrequency of the wave :

Answer»

The distance between two successive crests or troughs is known as wavelength so wavelength=100cm .(because distance between crest & trough is 50cm)in 0.2 second,it complete 20 wave in 1 second,it will complete 20x5=100 crests.so frequency is 100 Hz



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