Sound waves of wavelength λ travelling

Question:

Sound waves of wavelength λ travelling in a medium with a speed of v m/s enter into another medium where its speed is 2v m/s. The wavelength of sound waves in the second medium is

(a) λ

(b) λ/2

(c) 2 λ

(d) 4 λ

Solution:

The correct answer is (c) 2 λ

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