Corresponding to given observation calculate speed of sound. Frequency of tuning fork = $340 Hz$
Resonance Length from the water level (in cm)
During falling During rising
First 23.9 24.1
Second 73.9 74.1

Moderate

Solution

Mean length from the water level in first resonance is
$l_{1} = \frac{23.9 + 24.1}{2}$
$= 24.0 cm$
Similarly, mean length from the water level in second resonance is
$l_{2} = \frac{73.9 + 74.1}{2}$
$= 74.0 cm$
Speed of sound,
$v = 2 f (l_{2} - l_{1})$
$= 2 \times 340 (0.740 - 0.240)$
$= 380 m / s$

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Resonance	Length from the water level (in cm)
	During falling	During rising
First	23.9	24.1
Second	73.9	74.1