CHAPTER 5 Astro.docx

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2 Apr 2012
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CHAPTER 5
LIGHT AND MATTER
5.1
Light is a form of energy and the energy it carries is called radiative energy. The other
two type of energy’s are kinetic energy (energy of motion) and potential energy (stored
energy)
The rate of energy flow is called power and its measured in watts (1 WATT = 1 JOULES)
Humans require about 10 million joules per day (same as a 100 watt light bulb)
Basic colors in a spectrum are red, orange, yellow, green, blue and violent
White is visible when all the basic colors are mixed in equal proportions
Light from the Sun and Light bulb is called white light because they contain all colors of
the rainbow
Wide variety of colors are created by mixing colors of the spectrum in varying
proportions
Primary colors of vision are red, blue and green. Alternate set of primary colors are
red, yellow, blue
CMYK (cyan, magenta, yellow and black) is used in graphics design and to print books
Light interacts in 4 basic ways:
1. Emission: a light bulb emits light; the energy of the light bulb comes from
electrical potential energy supplied to the light bulb
2. Absorption: When we place our hand near a light bulb, our hand absorbs the
light and this absorbed light warms our hand.
3. Transmission: Some forms of matter, such as glass or air, transmit light, which
means allowing it to pass through
4. Reflection/Scattering: Light can bounce off matter, which we call reflection
(when the bouncing is all in the same general direction) or scattering (when the
bouncing is scatter)
Materials that transmit light are called transparent and materials that absorb light are
called opaque
5.2
Wavelength is the distance from one peak to the next one
Frequency (Hz) is the number of peaks passing by at any point in 1 second
Speed is used to measure how fast the energy travels from one place to another.
(speed= wavelength x frequency)
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