A harmonic wave is travelling along a rope .The source generating the waves completes 50 to and fro motions in 25 s.A trough travels 2m in 4s .calculate wavelength ,frequency and speed

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Solution

frequency = 50/25 = 2Hz

wavelength = speed of light ÷ freqency

= 3×10^7 ÷ 2
= 1.5 × 10^7 m

speed = 2m ÷ 4s
= 0.5 m/s

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