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AP EAMCET201823 Apr 2018Evening ShiftPhysicsThermodynamicsActual

A graph drawn between absolute temperature and volume of 3 moles of helium gas as shown in the figure. If 5 cal of heat is used in the process, then the work done is

Options

  1. A21.0 J
  2. B8.4 J
  3. C12.6 J
  4. D6.2 J

Correct answer

B. 8.4 J

Step-by-step solution

In given graph, V T V T = constant Hence, process is a constant pressure process. So, aligned Q= & n C_p T and W=p V=n R T=n R Q n C_p = & Q R 5 2 R = 2 5 Q=2 cal =2 4.2 ~J =8.4 ~J aligned

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