Test Index

JAMB Physics 2018 Paper

Question : 59

Total: 87

Solution:

Concept:

The distance of the hill is found using the speed of sound and the one-way travel time of the echo.

Explanation:

Speed of sound is calculated from

v = f\lambda

v = 260 \times 1.29 = 335.4\,\text{m/s}

The echo is heard after

2\,\text{s}

, which is the time for sound to go to the hill and return.

So the one-way time is

\frac{2}{2} = 1\,\text{s}

Distance to the hill is

d = v \times t

d = 335.4 \times 1 = 335.4\,\text{m}

Answer:

The correct answer is B.

335.4\,\text{m}

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