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On a very hot day, could you cool your kitchen by leaving the refrigerator door open?

(a) Yes, but it would be very expensive.

(b) Yes, but only if the humidity is below 50%.

(c) No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.

(d) No, the heat exhausted by the refrigerator into the room is more than the heat the refrigerator takes out of the room.

Short Answer

Expert verified

The correct option is (d).

Step by step solution

01

Principle of refrigerator

A refrigerator is a device to cool a lower temperature region by extracting heat from that region.

By doing work, heat is taken out from a low-temperature region (such as inside a refrigerator), and a greater amount of heat is exhausted to a high-temperature region (the room).

02

Explanation

On a very hot day, if you open your refrigerator door, it will not be possible to cool the whole kitchen because the heat exhausted by the refrigerator into the room is more than the heat the refrigerator takes out of the room.

Hence, option (d) is correct.

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Most popular questions from this chapter

Which of the following possibilities could increase the efficiency of a heat engine or an internal combustion engine?

(a)Increase the temperature of the hot part of the system and reduce the temperature of the exhaust.

(b) Increase the temperatures of both the hot part and the exhaust part of the system by the same amount.

(c) Decrease the temperatures of both the hot part and the exhaust part of the system by the same amount.

(d) Decrease the temperature of the hot part and increase the temperature of the exhaust part by the same amount.

(e) None of the above; only redesigning the engine or using better gas could improve the engine's efficiency.

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(b) the total change in the entropy.

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(II) Sketch a PV diagram of the following process: 2.5 L of ideal gas at atmospheric pressure is cooled at constant pressure to a volume of 1.0 L, and then expanded isothermally back to 2.5 L, whereupon the pressure is increased at constant volume until the original pressure is reached.

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FIGURE 15-26 Problem 53

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