19. A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the watersurface in the well. Taking g = 10 m s10 m s-2 and speed ofsound = 330 m s-/, find : (i) the depth of water surface,and (ii) the time when echo is heard after the pebble isdropped.

19. A pebble is dropped freely in a well from its top. It takes 20 s

1.	19. A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the watersurface in the well. Taking g = 10 m s10 m s-2 and speed ofsound = 330 m s-/, find : (i) the depth of water surface,and (ii) the time when echo is heard after the pebble isdropped.
Answer» TIME is TAKEN for pebble to reach the water surface = 20 s. Therefore, the total time taken to HEAR the ECHO after the pebble is DROPPED = 20 + 6.1 = 26.1 s.

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19. A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the watersurface in the well. Taking g = 10 m s10 m s-2 and speed ofsound = 330 m s-/, find : (i) the depth of water surface,and (ii) the time when echo is heard after the pebble isdropped.​

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19. A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the watersurface in the well. Taking g = 10 m s10 m s-2 and speed ofsound = 330 m s-/, find : (i) the depth of water surface,and (ii) the time when echo is heard after the pebble isdropped.