Physics

Problem

A mercury barometer kept at

35^{\circ}\text{C}

reads

74.0\,\text{cm}

. The density of mercury at

35^{\circ}\text{C}

13.5\times10^{3}\,\text{kg\,m}^{-3}

, whereas at

0^{\circ}\text{C}

it is

13.6\times10^{3}\,\text{kg\,m}^{-3}

. What would be the reading of the same barometer at

0^{\circ}\text{C}

if the atmospheric pressure remains unchanged? a)

74.5\,\text{cm}

74.0\,\text{cm}

73.5\,\text{cm}

73.0\,\text{cm}