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Q.

The phase difference between two points separated by 1m in a wave of frequency 120 Hz is 90o . The wave velocity is

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a

180 m/s

b

240 m/s

c

480 m/s

d

720 m/s

answer is C.

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Detailed Solution

Path difference Δ=λ2π×φ⇒1=λ2π×π2⇒λ=4mHence  = v=nλ=120×4=480 m/s
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