To measure the height of the mercury column in a barometer, abrass-scale is attached with it. Coefficient of real expansion of mercury is gamma and coefficient of linearexpansion of brass is alpha. Due torise in temperature, the effective coefficient at which the barometer reading increases is

To measure the height of the mercury column in a barometer, abrass-sca

1.	To measure the height of the mercury column in a barometer, abrass-scale is attached with it. Coefficient of real expansion of mercury is gamma and coefficient of linearexpansion of brass is alpha. Due torise in temperature, the effective coefficient at which the barometer reading increases is
Answer» `GAMMA` `gamma+alpha` `gamma-alpha` `gamma-2alpha` ANSWER :C