Q. A student determines the velocity of sound with the help of a closed organ pipe. If the observed length for fundamental frequency is $24.7\ m,$ the length for third harmonic will be
A) $74.1\ cm$
B) $72.7\ cm$
C) $75.4\ cm$
D) $73.1\ cm$
Explanation
(a) $l_{2} = 3l_{1} = 3 \times 24.7 = 74.1\ cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.