Question

On producing the waves of frequency $1000Hz$ in a Kundt's tube, the total distance between $6$ successive nodes is $85$ cm. Speed of sound in the gas filled in the tube is

• A. $330m/s$
• B. $340m/s$
• C. $350m/s$
• D. $300m/s$

Answer 1

The correct option is B $340m/s$

$\begin{array}{c}Dis\tan cebetweensixsuccessivenode=\frac{5\lambda }{2}=85cm\\ \lambda =\frac{2\times 85}{5}=34cm=0.34m\\ Speedofsoundingas=n\lambda =1000\times 0.34\\ =340m/s.\end{array}$

Hence, the option $B$ is the correct answer.