At sea level, the atmospheric pressure is $76 c m$ of Hg. If air pressure falls by $10 m m$ of Hg per $120 m$ of ascent, what is the height of a hill where the barometer reads $70 c m H g$ .

720 m

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760 m

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720 c m

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760 c m

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Solution

The correct option is A $720 m$
Atmospheric pressure falls linearly with ascent.
Here atmospheric pressure at sea level $= 76 c m$ of Hg
For every $10 m m = 1 c m$ decrease there is a increase of $120 m$ so, at $70 c m$ of Hg
$h e i g h t = 76 - 70 = 6 \times 120 = 720 m$

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At sea level, the atmospheric pressure is 76cm of Hg. If air pressure falls by 10mm of Hg per 120m of ascent, what is the height of a hill where the barometer reads 70cmHg.

The correct option is A 720mAtmospheric pressure falls linearly with ascent.Here atmospheric pressure at sea level =76cm of HgFor every 10mm=1cm decrease there is a increase of 120m so, at 70cm of Hgheight=76−70=6×120=720m

At sea level, the atmospheric pressure is $76 c m$ of Hg. If air pressure falls by $10 m m$ of Hg per $120 m$ of ascent, what is the height of a hill where the barometer reads $70 c m H g$ .

The correct option is A $720 m$
Atmospheric pressure falls linearly with ascent.
Here atmospheric pressure at sea level $= 76 c m$ of Hg
For every $10 m m = 1 c m$ decrease there is a increase of $120 m$ so, at $70 c m$ of Hg
$h e i g h t = 76 - 70 = 6 \times 120 = 720 m$