Question

All objects radiate heat but the amount of heat radiated from an object depends on its___________.

Answer 1

1. All the objects in the universe radiate heat to some extent.
2. And the amount of heat radiated depends on the three factors,
   (a) Colour and texture of the surface- Dark surface radiates more heat ad black colour is the best radiator.
   (b) Surface temperature- The higher the temperature of the body the greater the amount of radiation emitted.
   (c) Surface area- The object with a large surface area will absorb more radiation.

Hence, all objects radiate heat but the amount of heat radiated from an object depends on its colour, temperature and surface area.