An Ideal Gas Undergoes An Isothermal Expansion From State A To State B. In This Process

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An Ideal Gas Undergoes An Isothermal Expansion From State A To State B. In This Process

a) Q>0,_U=0,W>0. b)Q>0,_U=0,W<0. c)Q=0,_U=0,W>0. d)Q=0,_U>0,W>0. e)Q=0,_U<0,W<0
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Answer: a) Q>0,_U=0,W>0 In an isothermal process the internal energy remains constant (_U = 0). In an expansion the gas does work on the surroundings (W = 0). Since the internal energy is constant and the work is positive, the first law of thermodynamics requires the heat absorbed also be positive (Q = 0).
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