question_answer

In a closed organ pipe, the frequency of fundamental note is 50 Hz. The note of which of the following frequencies will not be emitted by it?

A)  50 Hz                                   

B)  100 Hz

C)  150 Hz                                 

D)  None of these

Correct Answer: B

Solution :

                When air is blown lightly at the open end of the closed pipe, then the air column vibrates as shown: The frequencies of fundamental tones and overtones of the closed pipe have the following relation \[{{n}_{1}}:{{n}_{2}}:{{n}_{3}}:......=1:3:5:.......\] that is, a closed pipe produces only odd harmonics. Hence, frequency of 100 Hz will not be emitted.