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
Correct Answer: Option C
Explanation
Velocity = (frac{text{distance}}{text{time}})
echo time = halt total time
= (frac{1}{2}) x 4 = 25
velocity = (frac{680}{2})
= 340ms-1