Question

A closed organ pipe has a fundamental frequency of 1.5 Khz. The number of overtones that can be distinctly heard by a person with this organ pipe will be : ( Assume that the highest frequency a person can hear is 20,000 Hz)

• A. 7
• B. 5
• C. 6
• D. 4

Answer 1

Answer: (A)

7

For closed organ pipe, resonate frequency is odd multiple of fundamental frequency.
(2n + 1) $f_o$ < 20,000
($f_o$ is fundamental frequency = 1.5 Khz)
n = 6
Total number of overtone that can be heared is 7. (o to 6)