Test Index

JAMB Physics 2014 Paper

Question : 23

Total: 41

340ms^{-1}

Solution:

Concept:

An echo is the reflection of sound. The time given includes the sound travelling to the hill and then back to the boy, so it is a round-trip time.

Explanation:

Total time for the clap to go to the hill and return is

0.8\,s

Therefore, the time taken for sound to reach the hill once is:

t = \frac{0.8}{2} = 0.4\,s

Using the distance formula:

\text{Distance} = \text{speed} \times \text{time}

\text{Distance} = 340\,ms^{-1} \times 0.4\,s

\text{Distance} = 136\,m

The correct option is

136\,m

Answer:

136\,m

Go to Question:

Prev Question

Next Question