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**[[S-wave]]s
***[[Structure of Earth]] - absorption of s-waves
==Light and Electromagnetic Waves==
===Frequency range of the spectrum===
====[[Electromagnetic Wave]]s==== - tranverse, vacuum, c, transfer energy/info
*[[Radiowave]]s
*[[Microwave]]s
*[[Infra-red]]
*[[Visible Light]]
*[[Ultra-violet]]
*[[X-ray]]s
*[[Gamma-ray]]s
===Interactions of electromagnetic radiation with matter and their applications===
*[[Transmission]]
*[[Absorption]]
*[[Reflection]] - TIR due to high to low medium
*[[Refraction]]
*[[Radiowave#Making Radiowaves|Making Radiowaves]]
*Atoms and Radiation, bohr model
====Applications of Electromagnetic Waves====
*[[Radiowave#Applications|Applications of Radiowaves]]
*[[Microwave#Applications|Applications of Microwaves]]
*[[Infra-red#Applications|Applications of Infra-red]]
*[[Visible Light#Applications|Applications of Visible Light]]
*[[Ultra-violet#Applications|Applications of Ultra-violet]]
*[[X-ray#Applications|Applications of X-rays]]
*[[Gamma-ray#Applications|Applications of Gamma-rays]]
====Dangers of Electromagnetic Waves====
*[[Radiowave#Dangers|Dangers of Radiowaves]]
*[[Microwave#Dangers|Dangers of Microwaves]]
*[[Infra-red#Dangers|Dangers of Infra-red]]
*[[Visible Light#Dangers|Dangers of Visible Light]]
*[[Ultra-violet#Dangers|Dangers of Ultra-violet]]
*[[X-ray#Dangers|Dangers of X-rays]]
*[[Gamma-ray#Dangers|Dangers of Gamma-rays]]
===Lenses===
*[[Refraction]]
*[[Lens]]
**[[Convex Lens]] - qualitative only
**[[Concave Lens]]
===Colour and frequency; differential effects in transmission, absorption and diffuse reflection===
*[[Colour]] - by absorption, transmission (filter) and scattering
*[[Specular Reflection]]
*[[Diffuse Reflection]]
===[[Black Body Radiation]]===
*[[Thermal Equilibrium]]
*[[Leslie Cube]]
*[[Albedo]] - planets incoming and outgoing