A tuning fork sends sound waves in air. If the temperature of the air increases, which of the following parameters will change ?

Monjur Alahi

A tuning fork sends sound waves in air. If the temperature of the air increases, which of the following parameters will change ?

(a) Displacement amplitude.

(b) Frequency.

(c) Wavelength .

(d) Time period .


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Salim Ahmed Kawsar

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(c) Wavelength .

EXPLANATION: 

When the sound wave is being sent by a tuning fork, its displacement amplitude, frequency and the time period will remain the same even if the temperature changes. Since the velocity of the sound V ∝ √T where T is the temperature in °K. Thus with the increase in temperature V increases, but = V/ν. Here ν is constant hence with the increase in V the wavelength also increases. Hence the option (c).

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