Question

A heated smooth metallic body is allowed to cool in air. Which of the following statements about its heat loss is incorrect?

Answer 1

Hint: in this question, first we will discuss different modes of heat transfer. This will help us to answer the given question. Further, we will discuss the basics of work and energy. Also, we will see the law of conservation of energy, for our better understanding.

Complete answer:
As we know that, heat transfer is defined as the mechanism that conveys energy and entropy from one location to another. There are specific mechanisms which are usually referred to as convection, thermal radiation, and conduction.
Now, as we know that the conduction involves transfer of energy and entropy between two or more adjacent molecules. Generally it is a slow process.
Also, convection involves the movement of a heated fluid, like air, generally a fairly rapid process.
The last one is radiation, it refers to the transmission of energy as electromagnetic radiation from its emission at any heated surface to its absorption on another surface. It is a process which requires no medium to convey the energy.
Therefore, we can say that when a heated smooth metallic body is allowed to cool in air,
here the rate of heat loss by thermal radiation is increased due to its metallic surface.

Additional information:
Here, work can be defined as the measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.
As we know that energy is defined as the ability to do work. Energy can be found in many things and can take different forms, like-kinetic energy is the energy of motion, and potential energy is energy due to an object's position or structure. Total energy of a system is given by the sum of kinetic energy and potential energy.
We also know that, according to the law of conservation of energy, energy can neither be created nor be destroyed; rather it can only be transferred from one form to another. Here, in this question electrical energy is transferred to heat energy.
We should also know about the power. It is the amount of energy transferred or converted per unit time. In the International System or S.I Unit of power is the watt. The S.I unit of power can also be written as one joule per second. Power is a scalar quantity, which means it has only magnitude not direction.

Note:
We should remember that the laws of conservation of energy can never be violated in any case. According to the law of conservation of energy, energy can neither be created nor be destroyed; rather it can only be transferred from one form to another.