The height of a barometer at a temperature of 30^(@) C appears to be 76 cm according to the brass scale which gives correct readmg at 0^(@) C. ( alpha_("Brass") = 19 xx 10^(-6)//^(@) C, gamma_(Hg) = 180 xx 10^(-6)//^(@) C )

The height of a barometer at a temperature of 30^(@) C appears to be 7

1.	The height of a barometer at a temperature of 30^(@) C appears to be 76 cm according to the brass scale which gives correct readmg at 0^(@) C. ( alpha_("Brass") = 19 xx 10^(-6)//^(@) C, gamma_(Hg) = 180 xx 10^(-6)//^(@) C )
Answer» `74.22 CM` `77.44 cm` `78.49 cm` `79.94 cm` ANSWER :B