Question

A tuning fork is sounded above an adjustable length resonating tube (one end closed), which resonates at a length of 0. 250 m and again at 0. 750 m. What is the frequency of the fork when the speed of sound is taken to be 340 m/s?.

Answer 1

The frequency of the fork when the speed of sound is taken to be; 680 Hz.

Frequency of a wave

From the given question;

• We can determine the wavelength of the sound wave produced by the tuning fork by evaluating the distance between the two reasonance points.

Hence, wavelength, = 0.750m - 0.250m

• Wavelength = 0.50m

Hence, the frequency of the fork when the speed of sound is taken to 340 m/s is

• Frequency = Speed/wavelength

• Frequency = 340/0.5

• Frequency = 680 Hz.

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