AST101H1 Lecture Notes - Lecture 5: Energy Level, Atomic Number, Primary Color

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Michael Reid

Document Summary

Warmth of sunlight tells us that light is a form of energy. Energy that light carries is called radiative energy. Energy and power: rate of energy flow is called power, which we measure in units called watts. Light and color: spectrum = prism split light into the rainbow of light. While light is made up of basic colors mixed. Black is perceived when there"s no light, dark: primary colors of vision are red, green and blue. Directly detected by eyes: can also produce spectrum with a diffraction grating = piece of plastic or glass etched with many closely spaced lines. Light interacts with matter in 4 diff. ways: emission = process by which matter emits energy in the form of light. Ex. light build emits visible energy: absorption = process by which matter absorbs radiative energy. Ex. hands get warm when put near a light bulb: transmission = process by which matter allows light to pass through.