Question

Name the body which absorbs all colours.
A) Black
B) White
C) Red
D) Yellow

Answer 1

Hint:When atoms or compounds absorb light of the appropriate frequency, their electrons are excited to higher energy levels. Coloured atoms absorb visible light that is coloured light and this absorption is the cause for their colour. Our eyes perceive a mixture of all of the colours, as in the portion in sunlight, as white light.

Complete step by Step solution:
The more amount of light that the object mops up the more amount of heat is absorbed since light is a form of energy. If we consider it a colour, black colour mops up the most heat. A black object absorbs all wavelengths from the light and reflects none of the light rays. Objects that are white, on the other hand, reflect all wavelengths of light and therefore absorb the very less heat.
Black coloured materials absorb all colours, such that no light is reflected. Black isn't really a colour. It’s the non-appearance of colour. Colours have the colour they do because the named colour is the light colour that they reflect. In other terms, a red coloured item reflects red light and absorbs all other colours. A blue coloured item reflects blue but absorbs all other colours except blue. So, when an item is said to be black, it reflects no colour: therefore, all colours are absorbed.

Therefore, the body that does not absorb all other colours is black colour.

Hence, the option (A) is the correct answer.

Note:A black object which absorbs all the colours of the visible spectrum and reflects none of them to the eyes. The grey area about black colour is that a black object may look black but scientifically, it may still be reflecting some light.