A balloon filled with Helium gas cannot continue to rise indefinitely. This happens because
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a
Size of the balloon gradually decreases, hence, buoyant forces decreases
b
Size of balloon increases, hence, buoyant forces increases
c
Weight of the gas filled balloon gradually decreases
d
Density of air decreases, hence, buoyant forces decreases
answer is D.
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Detailed Solution
As the balloon rises, density and pressure of air decrease. As a result volume of the balloon increases. Buoyant force B=ρVg. Effect of decrease in density dominates over the effect of increase in volume. Hence buoyant force decreases and the balloon stops rising further.