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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

In a large room, a person receives direct sound waves from a source $120 m$ away from him. He also receives waves from the same source after being reflected from the $25 m$ high ceiling, at a point halfway between them. The two waves interfere constructively for a wavelength of

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Answer:

Solution:

Path difference between the waves

$Δ x = 130 - 120 = 10 m$

As phase between the two waves is $π$ because reflection takes place from the rigid end, so for constructive interference.

$Δ x = (2 n + 1) \frac{λ}{2}$

$10 = (2 n + 1) \frac{λ}{2}$

$∴ λ = \frac{20}{2 n + 1}$

$n = 0, λ_{1} = 20 m$

$n = 1, λ_{2} = \frac{20}{3} m$

$n = 2, λ_{3} = \frac{20}{5} m$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Sound WaveSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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