The brass scale of a barometer gives correct reading at . The baraometer reads at . What is the....

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The brass scale of a barometer gives correct reading at . The baraometer reads at . What is the atmospheric pressure at ?
\[
\left(\alpha_{\text {Brass }}=20 \times 10^{-6} /{ }^{0} \mathrm{C} ; \gamma_{\mathrm{Hg}}=175 \times 10^{-6} /^{0} \mathrm{C}\right)
\]
a.
b.
c.
d.
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