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WAEC Physics 2015 Paper

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Question : 25

Total: 50

The diagram given illustrates a wave form. Determine the speed of the wave

5.4 ms^-1
8.4 ms^-1
9.6 ms^-1
10.0 ms^-1

Solution:

Concept:

Wave speed is found using

v = f \lambda

.

Explanation:

From the diagram, the wavelength is

\lambda = 2.4\ \mathrm{m}

.

The time taken for one complete oscillation is

T = 0.25\ \mathrm{s}

.

So the frequency is:

f = \frac{1}{T} = \frac{1}{0.25} = 4\ \mathrm{Hz}

Now calculate the wave speed:

v = f \lambda = 4 \times 2.4 = 9.6\ \mathrm{m\,s^{-1}}

Answer:

Option C:

9.6\ \mathrm{m\,s^{-1}}

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