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a
Invar is an alloy which has a very small coefficient of linear thermal expansion. Hence, the time period does change appreciably with the change of temperature.
b
Invar is an alloy which has a very small coefficient of linear thermal expansion. Hence, the time period does not change appreciably with the change of temperature.
c
Invar is an alloy which has a very small coefficient of linear thermal expansion. Hence, the time period becomes double with the change of temperature.
d
Invar is an alloy which has a very small coefficient of linear thermal expansion. Hence, the time period becomes half with the change of temperature.
answer is B.
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