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a).Explain how the following affect the velocity of sound in air.
(i) Wind
(ii) Temperature
(iii) Humidity
b) A girl standing in a gorge between two cliffs claps her hands at a steady rate ad hears two echoes. The first eco comes after 2 seconds and the other after 3 seconds. If the speed of sound is 340m/s, what is the distance between the cliffs?

Answer Text:
i).Wind blowing in the same direction increases the velocity of sand. The reverse is true
ii).Sound travels faster in hot air than in cold air.
iii).Velocity of sound increases with humidity.