The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first : boat man or diver?
(ii) Give a reason for your answer in part (1).
(iii) If sound takes time to reach the boat man, how much time approximately does it take to reach the diver?

Explanation

### Step-by-Step Solution:

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

The diver would hear the sound first.

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

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