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WAEC Physics 2021 Paper

Question : 26

Total: 50

Solution:

Concept:

Speed of a wave is the product of its frequency and wavelength:

v = f \lambda

Explanation:

From the diagram, the wavelength is

\lambda = 9\ \text{cm}

The period is given as

T = 0.125\ \text{s}

First, find the frequency:

f = \frac{1}{T} = \frac{1}{0.125} = 8\ \text{Hz}

Now, calculate the speed:

v = f \lambda = 8 \times 9 = 72\ \text{cm/s}

Answer:

The speed of the wave is

72\ \text{cm/s}

Correct option: D.

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