Solve this :

10.    A disused railway line has a length of 300 m. A man puts his car against one end of the rail and another man hits the other end with a metal hammer, as shown in the figure .
 

 
(a) (i)    State an approximate value for the speed of sound in air.

      (ii)  Sound travels at 5000 m/s in steel. calculate the time it takes for the sound travel along the rail .

Dear Student

(a) Speed of sound in air is 343 m/s.

(b) Speed of sound in steel is 5000 m/s. Distance it needs to travel is 300 m
So time taken by sound to travel rail is
t = distance /speed = 300/5000 = 0.06 s

Regards

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