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NEET 2015
Exam
NEET
Year
2015
Subject
Physics
Chapter
Thermodynamics

NEET 2015 · Physics · Thermodynamics

The coefficient of performance of a refrigerator is 5 . If the...

The coefficient of performance of a refrigerator is 55. If the temperature inside the freezer is −20°C- 20 ° C, the temperature of the surrounding to which it rejects heat is:The coefficient of performance of a refrigerator is 5 . If the temperature inside the freezer is - 20 ° C , the

Options

  1. A41°C41 ° C
  2. B11°C11 ° C
  3. C21°C21 ° C
  4. D31°C31 ° C

Correct answer

D. 31°C31 ° C

Step-by-step solution

The coefficient of performance of a refrigerator is 5 . If the temperature inside the freezer is - 20 ° C , the


Coefficient of Performance = q2w=q2q1−q2=TcTH−TC=5\dfrac{{q}_{2}}{w} = \dfrac{{q}_{2}}{{q}_{1} - {q}_{2}} = \dfrac{{T}_{c}}{{T}_{H} - {T}_{C}} = 5

TC=5TH−5Tc{T}_{C} = 5{T}_{H} - 5{T}_{c}

6Tc=5TH6{T}_{c} = 5{T}_{H}

TH=65×253K=303.6K=30.6°C=31°C{T}_{H} = \dfrac{6}{5} \times 253K = 303.6K = 30.6 ° C = 31 ° C

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