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Q.

A simple pendulum is vibrating in an evacuated chamber, it will oscillate with 

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a

First (c) then (a) 

b

Decreasing amplitude 

c

Constant amplitude 

d

Increasing amplitude 

answer is B.

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Detailed Solution

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As it is clear that in vacuum, the bob will not experience any frictional force. Hence, there shall be no dissipation therefore, it will oscillate with constant amplitude. 

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