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?
A
170ms-1
B
136ms-1
C
340ms-1
D
680ms-1
E
510ms-1
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Velocity = \(\frac{\text{distance}}{\text{time}}\)
echo time = halt total time
= \(\frac{1}{2}\) x 4 = 2
velocity = \(\frac{680}{2}\)
= 340ms\(^{-1}\)
Source: Myschool Past Questions Archive (Record #29311)