The reading of a barometer containing some air above the mercury column is 73 cm , while that of a correct one is 76 cm. If the tube of the faulty barometer is pushed down into mercury until the volum

Question

The reading of a barometer containing some air above the mercury column is 73 cm , while that of a correct one is 76 cm. If the tube of the faulty barometer is pushed down into mercury until the volume of air in it is reduced to half, the reading shown by it will be:

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Answer:

A

Solution:

The trapped air is at $76 - 73 = 3 cm$ of Hg. Halving its volume doubles it to 6 cm of Hg, so the reading is $76 - 6 = 70 cm$ . A.

TestHub · Accepted Answer

The trapped air is at 76 − 73 = 3 cm of Hg. Halving its volume doubles it to 6 cm of Hg, so the reading is 76 − 6 = 70 cm . A.

Physics - Heat & Thermo Question with Solution | TestHub

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