Question

A vibrating blade produces sine wave in string. Blade is vibrating at $20Hz$ & velocity of wave along string is $8m/s$. Find minimum gap between two particles having phase difference equal to $\pi$.

• A. 16 m
• B. 1.6 m
• C. 0.8 m
• D. 0.2 m

Answer 1

The correct option is D 0.2 m

$v=n\lambda$
$\lambda =\frac{v}{n}=\frac{8}{20}=0.4m=40cm$

For out of phase particles minimum gap is $\frac{\lambda }{2}$
$=20cm$
$=0.2m$