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  4. A resonance air column of length 40 cm resonates with a tuning fork of frequency 450 Hz. Ignoring end correction, the velocity of sound in air will be :

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Q. A resonance air column of length $40\,cm$ resonates with a tuning fork of frequency $450 \,Hz$. Ignoring end correction, the velocity of sound in air will be :

JIPMERJIPMER 2004

Solution:

Here : Length of column $=40\, cm =0.4\, m$
Frequency of tuning fork $=450\, Hz$
Using the formula $n=\frac{v}{4 l}$
or $v=450 \times 4 \times 0.4$
$=720\, m / s$