The brass scale of a barometer gives correct reading at 00C . Coefficient of linear expansion of brass is 2×10−5/0C . The barometer reads 75cm at 27C 0. What is the atmospheric pressure at 27C 0 .

true value =scale reading C1+α△θ=751+2×10−5×27 =75.04cm

The brass scale of a barometer gives correct reading at 00C . Coefficient of linear expansion of brass is 2×10−5/0C . The barometer reads 75cm at 27C 0. What is the atmospheric pressure at 27C 0 .

true value =scale reading C1+α△θ=751+2×10−5×27 =75.04cm

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The brass scale of a barometer gives correct reading at $0^{0} C$ . Coefficient of linear expansion of brass is $2 \times 10^{- 5} /^{0} C$ . The barometer reads $75 c m$ at $27 {}^{0}C$ . What is the atmospheric pressure at $27 {}^{0}C$ .

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$75.04 c m$

$74.96 c m$

$75.4 c m$

$75.44 c m$

answer is A.

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true value =scale reading $(C 1 + α △ θ)$
$= 75 (1 + 2 \times 10^{- 5} \times 27) = 75.04 c m$

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The brass scale of a barometer gives correct reading at 00C . Coefficient of linear expansion of brass is 2×10−5/0C . The barometer reads 75cm at 27C 0. What is the atmospheric pressure at 27C 0 .

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The brass scale of a barometer gives correct reading at $0^{0} C$ . Coefficient of linear expansion of brass is $2 \times 10^{- 5} /^{0} C$ . The barometer reads $75 c m$ at $27 {}^{0}C$ . What is the atmospheric pressure at $27 {}^{0}C$ .