Electromagnetic waves

Interactive lesson
Light behaves as a waveInteractive lesson
What an electromagnetic wave isInteractive lesson
No medium neededInteractive lesson
Why no medium is neededInteractive lesson
Electromagnetic waves are transverseInteractive lesson
The speed of lightInteractive lesson
Nothing outruns lightInteractive lesson
Which waves need a mediumInteractive lesson
What oscillates in each kind of waveInteractive lesson
Light is far faster than sound

The electromagnetic spectrum

Interactive lesson
One continuous familyInteractive lesson
Longer wavelength, lower frequency — whyInteractive lesson
Greater frequency, more energyInteractive lesson
Order the spectrum by wavelengthInteractive lesson
Rank the spectrum by frequency and energyInteractive lesson
Calculate frequency or wavelengthInteractive lesson
Match band to applicationInteractive lesson
Absorption effects scale with frequencyInteractive lesson
All objects radiate — hotter radiates moreInteractive lesson
Hotter objects: the glow shifts toward blueInteractive lesson
Redshift and blueshiftInteractive lesson
Doppler shift applications

Polarization, color, and digital signals

Interactive lesson
Two polarizing filtersInteractive lesson
What polarization isInteractive lesson
Polarization proves light is transverseInteractive lesson
Polarization applicationsInteractive lesson
White light is a mixtureInteractive lesson
Why objects have colorInteractive lesson
Color under colored lightInteractive lesson
Analog vs digital signalsInteractive lesson
Why digital transmission and storage win