Question

Among the following colours, which is the highest absorbent of heat radiations?
A. White
B. Yellow
C. Black
D. Violet

Answer 1

Hint: Heat radiation refers to the radiation emitted from light energy. It can be said that a body which reflects more light is the one which absorbs the less heat radiation whereas the one which reflects less light is the one which absorbs the most heat. By comparing the darkness of the colour from the given options we have to find out which one has the highest absorbent of heat radiation.

Complete answer:
Heat energy obeys the law of conservation as light energy. If a substance or colour reflects most light wavelengths then it eventually reflects the most heat energy. Therefore, due to this reason, among the visual light, the colours that reflect most wavelengths of light tend to be cooler than those that reflect only a few. This principle thus also helps to stay warmer or cooler by wearing different clothes.

Dark colors absorb a lot more heat than lighter ones because they absorb more light energy or they reflect less light energy. In fact, the closer to black a colour is, the more heat it absorbs from light sources. From the given options here, black colour is the darkest among others. Hence, it reflects less light energy and is the highest absorbent of heat radiation.

So, the correct option is C.

Note: It must be noted that colours do not absorb different amounts of heat from light. Only, because the light colours reflect the more light, they get less heated. While the darker ones reflect less light hence eventually get more heated.