A) \[3.6\times {{10}^{3}}\] cal of heat flowed out from the gas
B) \[3.6\times {{10}^{3}}\] cal of heat flowed into the gas
C) \[1.5\times {{10}^{4}}\] cal of heat flowed into the gas
D) \[1.5\times {{10}^{4}}\] cal of heat flowed out from the gas
Correct Answer: A
Solution :
In isothermal compression, there is always an increase of heat. which must flow out the gas. \[\Delta Q=\Delta U+\Delta W\Rightarrow \Delta Q=\Delta W\ \ (\because \ \Delta U=0)\] Þ \[\Delta Q=-1.5\times {{10}^{4}}J=\frac{1.5\times {{10}^{4}}}{4.18}cal=-3.6\times {{10}^{3}}cal\]
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