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QNEET-2018-Ph-878: NEET 2018 Physics - Class 11 NEET-2018-Ph-878 Solution: The volume (V) of a monatomic gas varies with its temperature…

The volume (V) of a monatomic gas varies with its temperature (T) as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state A to state B is 2/5 2/3 1/3 2/7

Multiple Choice Options

A ${2 \over 5}$ 5 2 _
B ${2 \over 3}$ 3 2 _
C ${1 \over 3}$ 3 1 _
D ${2 \over 7}$ 7 2 _

Step-by-Step Verified Solution

Gas is monatomic, so C p = 5 2 R Given process is isobaric. _ dQ = nC p dT or dQ = n ( 5 2 R ) dT Also, dW = PdV = nRdT ( _ PV = nRT) _ Required ratio = d W d Q = n R d T n ( 5 2 R ) d T = 2 5

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