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WAEC Physics 2023 Paper

Question : 24

Total: 50

[speed of sound in air = 331 m/s]

Solution:

Concept:

The wavelength of a sound wave is found from the wave equation using its speed and frequency.

Explanation:

The speed

v

, frequency

f

, and wavelength

\lambda

of a wave are related by

v = f\lambda

Here,

v = 331\ \mathrm{m/s}

and

f = 512\ \mathrm{Hz}

The distance of

100\ \mathrm{m}

given in the question is not needed to find the wavelength.

Rearrange the formula to solve for

\lambda

\lambda = \frac{v}{f} = \frac{331}{512}

\lambda = 0.646\ \mathrm{m}

Answer:

The wavelength is

0.646\ \mathrm{m}

, which is option B.

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