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A boy whistles once at a distance 250 m from a vertical cliff. If the temperature in the surrounding is 50C .If the speed of sound = (331.5m/s at 00c) the speed in air increases at about 0.6 m/s per 0C,

  1. Determine the distance travelled by sound.
  2. Determine the speed travelled at 50C. 
  3. Calculate the time taken for the boy to hear the echo

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  1. Distance travelled =  2d = 250 x2 =500m
  2. Speed at 5ºC = 331.5+ (0.6 × 5) = 334.5m/s
  3. Time taken = distance/speed = 500/334.5
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