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Q.

The distance between two consecutive points with phase difference of 60°  in a wave of frequency 500 Hz is 6.0 m. The velocity with which wave is travelling is ....... km/s  

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answer is 18.

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Detailed Solution

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ϕ=60∘=π3,Δx=6m,n=500Hzϕ=2πλΔx π3=2πλ×6λ=36mV=nλ=500×36=18000m/s=18km/s

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