Question

A wave pulse traveling on a two piece string, gets partially reflected and partially transmitted at the junction. The reflected wave is inverted in shape as compared to incident one. If the incident wave has wavelength $\lambda$ and transmitted wave has ${\lambda }^{\prime },$ then

• A. ${\lambda }^{\prime }>\lambda$
• B. ${\lambda }^{\prime }=\lambda$
• C. ${\lambda }^{\prime }<\lambda$
• D. none

Answer 1

The correct option is C ${\lambda }^{\prime }<\lambda$

Reflected wave is inverted hence second medium is dir sec with respect to first medium. ${\lambda }^{\prime }<\lambda$

We know that,

$\frac{{\lambda }^{\prime }}{t}<\frac{\lambda }{t}$

$\Rightarrow {\lambda }^{\prime }<\lambda$

Ans. (C)