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AP EAMCET202018 Sep 2020Morning ShiftPhysicsThermodynamicsActual

There is no change in internal energy of an ideal gas when it undergoes

Options

  1. Aisothermal expansion
  2. Badiabatic expansion
  3. Cfree expansion
  4. Disobaric expansion

Correct answer

C. free expansion

Step-by-step solution

In free expansion, the ideal gas is allowed to expand into a vacuum. This happens quickly, so there is no heat transferred. No work is done, because the gas does not displace anything. According to first law of thermodynamics, this means that ( E_ internal =0 ) Hence, there is no change in internal energy of an ideal gas when it undergoes free expansion.

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