A herdsman yelling out to fellow herdsman heard his voice reflected by a cliff 4s later. What is the velocity of sound in air if the cliff is 680m away - TEEZAB

# A herdsman yelling out to fellow herdsman heard his voice reflected by a cliff 4s later. What is the velocity of sound in air if the cliff is 680m away

Jamb 1978

A herdsman yelling out to fellow herdsman heard his voice reflected by a cliff 4s later. What is the velocity of sound in air if the cliff is 680m away? A. 170m/s B. 136m/s C. 340m/s D. 680m/s E. 510m/s

ANSWER: Option C

EXPLANATION: Apply the formula below;

V = 2d/t

Why 2d? Because for an observer to hear an echo, it means the sound travels a distance, hits an obstacle and then reflects back the same distance from the observer! Meaning, it travels twice the distance between the observer and the obstacle!

Previous       Next

Or click here to choose!

Of course, your opinion(s) and suggestion(s) is/are welcome. In case you have any, kindly use our comment box.

If you have any questions, you can also drop them in the comment section.

If you find this post beneficial, feel free to use the share button to share with friends.

Follow us on our Facebook page!