In a mechanical refrigerator, the low te...

In a mechanical refrigerator, the low temperature coils are at a temperature of `-23^(@)` C and the compressed gas in the condenser has a temperature of ` 27^(@)C`. The theoretical coefficient of performance is :-

0.7

0.2

0.0023

`2.5%`

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In a refrigerator, the low temperature coil of evaporator is at -23^@C and the compressed gas in the condenser has a temperature of 77^@C . The amount of electrical energy spent in freezing 1 kg of water at 0^@C is

`134400 J`

`1344 J`

`80000 J`

`3200 J`

the speeds of the molecule increase

the collisions between the molecules increase

the speeds of the molecules decrease

the collisions between the molecule decrease

the speeds of the molecules increase

the collisions between the molecules increase

the speeds of the molecules decrease

the collisions between the molecules decrease