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A wave of frequency 2000 Hz travels between X and Y , a distance of 1020m in 3 seconds . The number of wavelengths there in distance X and Y
So, 2000 Hz means 2000 wavelengths per second.It is given that the distance between X and Y i.e., 1020 m is travelled in 3 seconds.This implies that number of wavelengths between X and Y is 2000 × 3 = 6000
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