Lecture 3-Chapter 5.1 – Light in Everyday Life, Chapter 5.2 – Properties of Light, Chapter 5.5 – The Doppler Shift

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Astronomy & Astrophysics
Stefan Mochnacki

Chapter 5.1 Light in Everyday Life Energy and Power N In science, the rate of energy flow is called power. N The standard units of power are called watts. N A power of one watt means an energy flow of joule per second: 1 watt = 1 joules. o ie, for every second you leave a 100-watt light bulb turned on, 100 joules of energy is used. Light and Colour N A prism that split light into the rainbow of light is called a spectrum. N The basic colours in a rainbow-like spectrum are red, orange, yellow, green, blue, and violet. White comes in when basic colours are mixed in roughly equal proportions. N Light from the Sun or a light bulb is called white light, because it contains all the colours of the rainbow N Black is what we perceive when there is no light and hence no colour. N Red, green, and blue are primary colours of vision, because they are the colours directly detected by cells in your eyes. N Because colours look different on paper, an alternate set of primary colours are red, yellow, and blue. N Spectrum can be produced either with a prism or a diffraction grating a piece of plastic or glass etched with many closely spaced lines. Interaction of Light and Matter 4 basic ways
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