JEE Main & Advanced
Sample Paper
JEE Main - Mock Test - 35
question_answer
When a large air bubble rises from the bottom of a lake to the surface, its radius doubles. If the atmospheric pressure is equal to that of a column of water of height H, then depth of the lake is
A)H
B)2 H
C)7 H
D)8 H
Correct Answer:
C
Solution :
We get, If r is 2 times, V becomes 8 times at the surface of lake. Pressure at the surface of lake is given where, Pressure at the bottom of lake, where, h = depth of lake Let final volume, . Because temperature is constant, hence from Boyle?s law