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Question

When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of 12 cm. What is the wavelength of the sound wave?

A
3 cm
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B
6 cm
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C
1 cm
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D
4 cm
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Solution

The correct option is D 4 cm
Wavelength (λ) is the distance between two consecutive crests or troughs in a sound wave.
Given that the distance between mid points of four consecutive troughs constitute a distance of 12 cm.


From the figure, 3×λ=12 cm
Wavelength, λ=123=4 cm

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