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Two identical metal blocks L and M(specific heat = 0.4 kJ/kg K), each having a mass of 5 kg, are initially at 313 K. A reversible refrigerator extracts heat from block L and rejects heat to block M until the temperature of block L reaches 293 K. The final temperature (in K) of block M is ______ .
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- 451
- 333
- 323
- 222
- None of these
Correct Option: B
Given m1 = m2 = 5 kg
c1 = c2 = 0.4 kJ/ kg.K
TL,i = TM,i = 313 K
TM.f = 293 K, TL.f =?
m1 c1 ∆T1 = m2 c2 ∆T2
∆T1 = ∆T2
TL,i – TL.f = TM,i – TM,f
313 – TL.f = 313 – 293
TL.f = 333 k
