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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)

7

6

5

4

Solution:

The correct option is A 7
For closed organ pipe, resonant frequency is odd multiple of fundamental frequency (2n + 1)fo < 20,000
(fo is fundamental frequency = 1.5 Khz)
n = 6
Total number of overtones that can be heard is 7. (0 to 6)