Transcript Energy in Earth Processes
Electromagnetic Energy
Topic 5 Energy in Earth Processes
energy The ability to do work
Electromagnetic energy The type of energy given off in transverse waves by all matter above absolute zero Each kind of e-mag energy has its own wavelength
wavelength
Electromagnetic spectrum A model showing all the forms of e-mag energy
Page 14 ESRT Visible light can be broken down into colors by wavelength.
The hotter the object the more e-mag energy it gives off.
high low cold hot Temperature of Object
The hotter the object, the shorter the wavelength given off.
long short cold hot Temperature of Object
refracted E-mag waves can be scattered absorbed reflected transmitted
The characteristics of a surface determine the amount and kind of e-mag energy absorbed.
Color - dark absorb more/reflect less Texture (rough/smooth) - rough absorbs more Luster/reflectivity (shiny/dull) - dull absorbs more
source Region with a higher concentration of energy than its surroundings
Sink (no, not the kitchen kind) Region with a lower energy concentration than its surroundings Energy always flows from a source to sink.
* Energy is transferred across interfaces.
source sink 50°C 30°C
The source radiates more than it absorbs.
*temperature decreases* The sink absorbs more than it radiates.
*temperature increases*
* Energy is transferred across interfaces.
40°C 40°C
The 2 objects absorb the same amount that they radiate.
* temperature is constant* This is called dynamic equilibrium balance .
or radiative
Energy Transformations When e-mag energy of short wavelength is absorbed, it can be reradiated at longer wavelengths.
A material that is a good absorber of electromagnetic energy is a good radiator of electromagnetic energy.