# The acceleration due to gravity changes from 9.8  to 9.5 . To keep the period of pendulum constant, its length must changes by Option 1) 3 m Option 2) 0.3 m Option 3) 0.3 cm Option 4) 3 cm

As discussed in

Time period of oscillation of simple pendulum -

- wherein

l = length of pendulum

g = acceleration due to gravity.

g changes from  to

length changes by 3 cm

Option 1)

3 m

This solution is incorrect.

Option 2)

0.3 m

This solution is incorrect.

Option 3)

0.3 cm

This solution is incorrect.

Option 4)

3 cm

This solution is correct.

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