Q. The frequency of fundamental note in an organ pipe is 240 Hz. On blowing air, frequencies 720 Hz and 1200 Hz are heard. This indicates that organ pipe is
A) A pipe closed at one end
B) A pipe open at both ends
C) Closed at both ends
D) Having holes like flute
Explanation
(a) Since,
$\frac{720}{1200} = \frac{6}{10} = \frac{3}{5},i.e.,\ 3:5$
Odd harmonics are produced only if the pipe is closed at one end.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.