Question

A refrigerator works on the principle of ---- law of thermodynamics.
A. zeroth
B. first
C. second
D. third

Answer 1

Hint As we know that according to the law of thermodynamics the energy is transferred from a higher temperature to a lower temperature. But the energy must have to be transferred from lower temperate to the higher temperature eternal work has to be applied.

Complete Step by step solution:
- It is found that the second law of thermodynamics states that it is basically impossible for a self-acting machine unless and until energy is provided by any external agency, to transfer heat from a body that is having low level of temperature to another at high temperature. And in the working of refrigerators this principle is mainly used.
- It is found that the refrigerator that we use in our house, ice and food act as the cold reservoir, whereas the surrounding act as a hot reservoir.
- And it is found that the work is basically done by the electric motor and freons having formula $\left( CC{{l}_{2}}{{F}_{2}} \right)$ .

- Hence, we can conclude that the correct option is (c), that is a refrigerator works on the principle of the second law of thermodynamics.

Note: As we know that we can find the coefficient of performance of the refrigerator, which is basically the ratio of the amount of heat removed to the mechanical work done by the motor on the refrigerator.
- We can see that the formula is:
$\beta =\dfrac{{{Q}_{2}}}{W}$