Question

Explain in 200 WORDS 2.

Question 2: Suppose That Sunlight Falls Both On A Pair Of Reading Glasses And On A Pair Of Dark Sunglasses. Which Pair Of Glasses Would You Expect To Become Warmer?

Defend your answer in 200 words

N/B: In Defending The Answer, Include Concepts From The Principles Of Temperature.

Answer 1

Substance become warmer when temperature is raised due to absorbtion of energy by it. Energy absorbed ratseg increases the kinetic energy of the molecules of the substance hence temperature of substance increases, making it feel warmer. Light (energy) passes through transparent medium like glass air, etc without being absorbed much. It is absorbed only by the surfaces on which it is incident, like the surface of earth. Due to this fact the temperature of surface of earth is much greater than the transparent air above it. Further the surface on which light is incident will also reflect some abnount of energy. The fraction of radiation, incident on a surface, absorbed or reflected will depend on the color of that surface. Dark colored objects will absorb Incore broader range of wavelength of radiation. (hence more number of photons) while reflecte(lesser number of photons) and narrower range of wavelength, this is why these object appear darker, as color of an object oppears is related to what color (wave- length) is absorbs. For example if an object absorbs yellow light, then it will reflect all the other colors of light and will look violet. A black object appears black because it absorbs I all wavelengths of light and reflects none , while I a white object reflects all wavelength of light, The light energy absorbed is converted into heat, thus rousing the temperature. From above facts, it can be concluded that light (radiation) doesn't heat up the medium through which it passes it only heats up on which it falls. Secondly the dark colored objects absorb more energy compared to to light colored objects, These facts implies that a pair of dark sunglasses will absorb large amount of energy (radiation) that the transparent reading glasses. This dark sunglasses are expected to becomer warmer