Question

Sound waves of wavelength $\lambda$ travelling with velocity $v$ in a medium enter into another medium in which their velocity is $4v$. The wavelength in $2^{nd}$ medium is :

• A. $4\lambda$
• B. $\lambda$
• C. $\lambda /4$
• D. $16\lambda$

Answer 1

The correct option is A $4\lambda$

From $v=n\lambda$ we find $\lambda \propto v$ because frequency n is constant .

Therefore ,

new wavelength = $4\lambda$