Q.

Why do we use Invar material for the pendulum of good clocks?

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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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Detailed Solution

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.
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