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?
Velocity = \(\frac{\text{distance}}{\text{time}}\)
echo time = halt total time
= \(\frac{1}{2}\) x 4 = 2
velocity = \(\frac{680}{2}\)
= 340ms\(^{-1}\)
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