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One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiabatic. The temperatures at A, B and C are 400 K, 800 K and 600 K respectively. Choose the correct statement :

Options

  1. AThe change in internal energy in whole cyclic process is 250 R
  2. BThe change in internal energy in the process CA is 700 R.
  3. CThe change in internal energy in the process AB is - 350 R
  4. DThe change in internal energy in the process BC is - 500 R

Correct answer

D. The change in internal energy in the process BC is - 500 R

Step-by-step solution

Δ U CA = nc v T A - T C = 1 × 5 2 R - 2 0 0 = - 5 0 0 R Δ U AB = nc v T B - T A = 1 × 5 2 R × 4 0 0 = + 1 0 0 0 R Δ U BC = nc v T C - T B = 1 × 5 2 R - 2 0 0 = - 5 0 0 R

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