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Brass scale of a Barometer gives correct reading at 00C. coefficient of linear expansion of brass is 18 × 10^-6 /°C. If the barometer reads 76cm at 20°C, the correct reading is
$(γ_{Hg} = 18 \times 10^{- 5} /^{0} C)$

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76.426 cm

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detailed solution

Correct option is B

True value = scale reading [l−(g−a)Δt]

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Brass scale of a Barometer gives correct reading at 00C. coefficient of linear expansion of brass is 18 × 10-6 /°C. If the barometer reads 76cm at 20°C, the correct reading isγHg=18×10−5/0C

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Ready to Test Your Skills?

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Brass scale of a Barometer gives correct reading at 00C. coefficient of linear expansion of brass is 18 × 10^-6 /°C. If the barometer reads 76cm at 20°C, the correct reading is
$(γ_{Hg} = 18 \times 10^{- 5} /^{0} C)$