Physics-
General
Easy
Question
A piston fitted in cylindrical pipe is pulled as shown in the figure. A tuning fork is sounded at open end and loudest sound is heard at open length 13cm, 41 cm and 69 cm, the frequency of tuning fork if velocity of sound is 
is
- 1250 Hz
- 625 Hz
- 417 Hz
- 715 Hz
The correct answer is: 625 Hz
In a closed organ pipe in which length of air-column can be increased or decreased, the first resonance occurs at 
and second resonance occurs at 
Thus, at first resonance
And a second resonance
Subtracting Eq.(i) from Eq.(ii), we have
Hence, frequency of tuning fork
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