Question

A sound wave has a wavelength $\lambda$. The distance between the first compression and the fourth rarefaction is

• A. $2.5\lambda$
• B. $\lambda$
• C. $3.5\lambda$
• D. $5\lambda$

Answer 1

The correct option is C $3.5\lambda$


Distance between two successive rarefactions is $\lambda$ (wavelength) and that between an adjacent compression and rarefaction is $\lambda /2$. Hence, distance between first compression and fourth rarefaction is $3.5\lambda$.