JAMB - Physics (1978 - No. 35)
A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?
170ms-1
136ms-1
340ms-1
680ms-1
510ms-1
설명
Velocity = \(\frac{\text{distance}}{\text{time}}\)
echo time = halt total time
= \(\frac{1}{2}\) x 4 = 25
velocity = \(\frac{680}{2}\)
= 340ms-1
echo time = halt total time
= \(\frac{1}{2}\) x 4 = 25
velocity = \(\frac{680}{2}\)
= 340ms-1