Q. On producing the waves of frequency $1000\ Hz$ 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) $330\ m/s$
B) $340\ m/s$
C) $350\ m/s$
D) $300\ m/s$
Explanation
(b) Distance between six successive node
$= \frac{5\lambda}{2} = 85cm \Rightarrow \lambda = \frac{2 \times 85}{5} = 34\ cm = 0.34\ m$
Therefore speed of sound in gas
$= n\lambda = 1000 \times 0.34 = 340\ m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.