STANDARD Physics Sound Waves MCQ Question
Sound waves of wavelength λ travelling in a medium with a speed of v m s⁻¹ enter into another medium where its speed is 2v m s⁻¹. Wavelength of sound waves in the second medium is
λ/2
λ
2λ
4λ
Correct Answer
Detailed Explanation
Wavelength of sound waves in the first medium, λ = v/v. In the second medium, λ' = 2v/v'. Since frequency remains unchanged, v = v'. Therefore, λ'/λ = 2, so λ' = 2λ.
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