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The phase difference between two points separated by 0.8 m in a wave of frequency 120 Hz is o90. Then the velocity of wave will be
Δϕ=90∘=2aaΔx=0.8mwe know that Δϕ=α2π×ΔxSo λ=Δϕ2π×Δx=π/22π×0.8⇒λ=3.2mv=120Hz & v=vλvelocityv=120×3.2=384m/s
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