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Question
A mercury pallet is trapped in a tube as shown in the figure. The tube is slowly heated to expel all mercury inside it (Isothermal condition). Heat given to the tube is ______.
(ρHg = 13.6 gm/cc, Atmospheric pressure = 105 Pa, cross- section area of tube = 2 cm2)
Options
1.145
2.136
3.125
4.145
MCQ
Fill in the Blanks
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Solution
A mercury pallet is trapped in a tube as shown in the figure. The tube is slowly heated to expel all mercury inside it (Isothermal condition). The heat given to the tube is 2.136.
Explanation:
`"W"_"gas" = -{"W"_{"gravity"} + "W"_{"external pressure"}}`
= `mgl + P_0lA` [m = mass of Hg pallet]
= 2.136 J
∴ ΔQ = ΔW
= 2.136 J
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Isothermal Processes
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