A) 100 Hz
B) 150 Hz
C) 250 Hz
D) None of these
Correct Answer: A
Solution :
In a pipe closed at one end and open at the other, the natural frequencies of oscillations form a harmonic series that includes only odd integer multiples of the fundamental frequency. Thus, \[{{f}_{n}}=n{{f}_{1}}\] \[(n=1,3,5,....)\] or \[{{f}_{n}}=50,150,250,....\] Hence, 100 Hz (even) frequency is not present in this series. Note: Here, 50 Hz is fundamental, 150 Hz is first overtone or third harmonic and 250 Hz is second overtone or fifth harmonic.
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