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Question

For an adiabatic free expansion of an ideal gas, which of the following is true?
  1. q=0, w=0, ΔU=0
  2. q=0, w=+ve, ΔU=ve
  3. q=0, w=+ve, ΔU=+ve
  4. q=+ve, w=0, ΔU=ve


Solution

The correct option is A q=0, w=0, ΔU=0
ΔU=q+w
For a free expansion work done is zero, since the external pressure is zero.

For an adiabatic process, q=0
Hence, from first law ΔU=0

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