When the temperature of a copper coin is raised by `80^@C`, its diameter increases by `0.2%`.

When the temperature of a coin is raised by 75^@C , the coin's diameter increase by 2.3xx10^(-5)m . If the original diameter of the coin is 1.8 xx10^(-2) m, find the coefficient of linear expansion .

When the temperature of a metallic sphere is increased by 40^(@)C then its volume increases by 0.24%. Coefficient of linear expansion of the metal in ""^(@)C^(-1) is

When the temperature of a gas is raised from 27^(@)C to 90^(@)C , the percentage increase in the rms velocity of the molecules will be

When the temperature of a gas is raised from 30^(@) C to 90^(@) C, the percentage increase in the rms velocity of the molecules will be

When the absolute temperature of the source of a Carnot heat engine is increased by 25 %, its efficiency increases by 80%. The new efficiency of the engine is

When the absolute temperature of the source of a Carnot heat engine is increased by 25 %, its efficiency increases by 80%. The new efficiency of the engine is