The sound of an explosion on the surface of a lake is heard by a boatman 100 m away and a diver 100 nbsp- m below the point of explosion - Of the two persons mentioned who would hear the sound first- Why-

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The sound of an explosion on the surface of a lake is heard by a boatman 100 m away and a diver 100
m below the point of explosion . Of the two persons mentioned who would hear the sound first? Why?

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The sound of an explosion on the surface of a lake is heard by a boatman 100 m away and by a diver 100 m below the point of explosion.

(i) Who would hear the sound first: boatman or diver?

(ii) Give a reason for your answer in part (i).

(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?

100 m

100 m

t

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