A barometer ·with brass scale, which is correct at 0°C, reads 75.000 cm on a day when the temperature is 20°C. Calculate correct reading at 0°C. (Coefficient of real expansion of mercury = 0.00018/°C and coefficient of linear expansion of brass = 0.0000189/0^(@)C.)

A barometer ·with brass scale, which is correct at 0°C, reads 75.000

1.	A barometer ·with brass scale, which is correct at 0°C, reads 75.000 cm on a day when the temperature is 20°C. Calculate correct reading at 0°C. (Coefficient of real expansion of mercury = 0.00018/°C and coefficient of linear expansion of brass = 0.0000189/0^(@)C.)
Answer» `74.758` CM `75.748` cm `74.825` cm `75.847` cm Answer :A