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Transcript of Energy
Energy- The ability to do work
Everything that is done in the Universe involves the transfer of energy
Earth is driven by two heat “engines”
The Earth's core
Electromagnetic energy-energy that is given off from all matter
not at absolute zero (-273° C, 0 Kelvin) where atoms have no motion.
•Travels in transverse waves- vibrate at right angles to the direction in which they move.
Transverse waves are named by their wavelength
Model of electromagnetic energy is Electromagnetic Spectrum p ________ESRT
•Visible light = Colors- The only part of the Electromagnetic Spectrum that can be seen by humans.
•Infrared- heating effects
Long wave electromagnetic energy- longer than visible light
Short-wave electromagnetic energy- shorter than visible light
Shorter waves are most intense
When electromagnetic energy comes into contact with matter it can be :
Refracted- bent- direction of waves change
•Reflected- bounces off
•Scattered- refracted in many directions
•Transmitted- passes through material
•Absorbed- taken into material
darker color absorbs more visible light
Rougher surface- more energy absorbed
If a material is a good absorber, it will also give off (radiate) easily
(Ex: If it heats up quickly in sunlight, it will cool quickly when the sun goes down.)
A GOOD ABSORBER IS A GOOD (re)RADIATOR!
Energy cannot be created or destroyed; it can only be transformed or transferred.