In Quincke’s experiment the sound detected is changed from a maximum to a minimum when the sliding tube is moved through a distance of 2.50 cm. Find the frequency of sound if the speed of sound in air is 340 m s-1.
Given:
Speed of sound in air ![]()
Distance moved by sliding tube = 2.50 cm
Frequency of sound ![]()
Distance between maximum and minimum:

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As we know,
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Therefore, the frequency of the sound is 3.4 kHz.