Q.

In order to find time, the astronaut orbiting in an earth satellite should use

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a

A pendulum clock

b

Neither a pendulum clock nor a watch

c

Either a pendulum clock or a watch 

d

A watch having main spring to keep it going

answer is B.

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Detailed Solution

In pendulum clock the time period depends on the value of g, while in spring watch, the time period is independent of the value of g.

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