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. Wavelength of sound waves in the second medium is

(a) λ

(b) 2 λ

(c) 2λ

(d) 4λ

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p> (c) Let frequency of the two will be&nbsp;<span contenteditable="false"> <math> <mi>v</mi> <mi> </mi> <mi>a</mi> <mi>n</mi> <mi>d</mi> <mi> </mi> <mi>v</mi> <mi>'</mi> </math> </span>&nbsp;and it is same in both medium</p><p>So v/<span contenteditable="false"> <math> <mi>λ</mi> </math> </span>= v’/<span contenteditable="false"> <math> <mi>λ</mi> </math> </span></p><p><span contenteditable="false"> <math> <mi>λ</mi> <mi>'</mi> </math> </span>= v’<span contenteditable="false"> <math> <mi>λ</mi> </math> </span>/v</p><p><span contenteditable="false"> <math> <mi>λ</mi> <mi>'</mi> </math> </span>= 2v<span contenteditable="false"> <math> <mi>λ</mi> </math> </span>/v=2<span contenteditable="false"> <math> <mi>λ</mi> </math> </span></p><p>Where<span contenteditable="false"> <math> <mi>λ</mi> </math> </span> and <span contenteditable="false"> <math> <mi>λ</mi> </math> </span>’ and v and v’ are wavelength and speeds of first and second medium respectively</p>

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