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

• 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.