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Question

Brass scale of a Barometer gives correct reading at 0C. Coefficient of linear expansion of brass is 18×106/C. If the barometer reads 76 cm at 20C ,the correct reading is (γHg=18×105/C):

A
76.426 cm
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B
75.7cm
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C
76.642 cm
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D
76.264 cm
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Solution

The correct option is C 75.7cm
Let the correct reading be l0.
Then reading at 20C=l0(1+αΔθ)
l0=l1+αΔθ
=75.7cm

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