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If two sound waves having a phase difference of 60°, then they will have a path difference of __________

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If two sound waves having a phase difference of 60°, then they will have a path difference of __________

(a) ʎ/6

(b) ʎ/3

(c) ʎ

(d) 3ʎ

I had been asked this question during an interview.

My question is taken from Superposition of Waves in portion Waves of Engineering Physics I

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The correct choice is (a) ʎ/6

To elaborate: ∆φ=60°=π/3

∆x=ʎ/2π×∆φ=ʎ/2π×π/3=ʎ/6.

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