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NEET2016PhysicsThermodynamicsActual

The temperature inside a refrigerator is t 2   o C and the room temperature is t 1   o C . The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

Options

  1. At 1 t 1 - t 2
  2. Bt 1 + 273 t 1 - t 2
  3. Ct 2 + 273 t 1 - t 2
  4. Dt 1 + t 2 t 1 + 273

Correct answer

B. t 1 + 273 t 1 - t 2

Step-by-step solution

K = Q 2 W = 1 t 1 t 2 - 1 Q 2 = t 2 W t 1 - t 2 . Q 1 = Q 2 + W = t 2 W t 1 - t 2 + W = t 1 W t 1 - t 2 . Since, t 1   &   t 2 are in o C   &  W   =   1    J , Q 1 = t 1 + 273 t 1 − t 2 .

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