Physics Exam > Physics Questions > A refrigerator is such that it extracts 20kJ ...
Start Learning for Free
A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)
Correct answer is '0.67'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A refrigerator is such that it extracts 20kJ of heat at a lower temper...
W = QK – QL
= 20/30
K = 0.67
The correct answer is: 0.67
Most Upvoted Answer
A refrigerator is such that it extracts 20kJ of heat at a lower temper...
Explanation:
The coefficient of performance (K) of a refrigerator is a measure of its efficiency and is defined as the ratio of the heat extracted from the refrigerator to the work done on the refrigerator.
K = Qc / W
where K is the coefficient of performance, Qc is the heat extracted from the refrigerator, and W is the work done on the refrigerator.
In this case, the refrigerator extracts 20 kJ of heat at a lower temperature and gives out 50 kJ of heat to the surroundings.
Heat extracted from the refrigerator (Qc) = 20 kJ
Heat given out to the surroundings (Qh) = 50 kJ
We can calculate the work done on the refrigerator using the first law of thermodynamics, which states that the work done on a system is equal to the heat added to the system minus the heat extracted from the system.
W = Qh - Qc
Substituting the values, we get:
W = 50 kJ - 20 kJ = 30 kJ
Now, we can calculate the coefficient of performance (K) using the formula:
K = Qc / W
Substituting the values, we get:
K = 20 kJ / 30 kJ = 0.67
Therefore, the coefficient of performance (K) of the refrigerator is 0.67.
The coefficient of performance (K) of a refrigerator is a measure of its efficiency and is defined as the ratio of the heat extracted from the refrigerator to the work done on the refrigerator.
K = Qc / W
where K is the coefficient of performance, Qc is the heat extracted from the refrigerator, and W is the work done on the refrigerator.
In this case, the refrigerator extracts 20 kJ of heat at a lower temperature and gives out 50 kJ of heat to the surroundings.
Heat extracted from the refrigerator (Qc) = 20 kJ
Heat given out to the surroundings (Qh) = 50 kJ
We can calculate the work done on the refrigerator using the first law of thermodynamics, which states that the work done on a system is equal to the heat added to the system minus the heat extracted from the system.
W = Qh - Qc
Substituting the values, we get:
W = 50 kJ - 20 kJ = 30 kJ
Now, we can calculate the coefficient of performance (K) using the formula:
K = Qc / W
Substituting the values, we get:
K = 20 kJ / 30 kJ = 0.67
Therefore, the coefficient of performance (K) of the refrigerator is 0.67.
|
Explore Courses for Physics exam
|
|
Similar Physics Doubts
A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer?
Question Description
A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer?.
A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer?.
Solutions for A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? in English & in Hindi are available as part of our courses for Physics.
Download more important topics, notes, lectures and mock test series for Physics Exam by signing up for free.
Here you can find the meaning of A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer?, a detailed solution for A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? has been provided alongside types of A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A refrigerator is such that it extracts 20kJ of heat at a lower temperature and give out 50kJ of heat to the surrounding, what is the coefficient of performance (K)Correct answer is '0.67'. Can you explain this answer? tests, examples and also practice Physics tests.
|
|
Explore Courses for Physics exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup