Question 6: All objects radiate energy. Explain why, then, are we not able to see objects in a dark room?
Objects kept in the dark also have some temperature and emit radiations. Therefore, objects in the dark room continuously emit and absorb radiations from the surrounding and are in thermal equilibrium with each other. However, these are infrared radiations. As human eyes are sensitive to the light in the visible range and infrared radiations do not fall in this range, therefore, we cannot see objects in the dark room despite the fact they emit radiations.