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When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be $1.5 \times {10^4}\;joules$. During this process about
  • 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
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