light waves
- wavelength ?
- distance between succesive peaks (draw on board)
- electric field strength for E-M waves
- height for water wave
- air pressure for sound waves
- wavelength ? can be anything
- 1 m => radio
- 0.5*10-6 m = 500 nm => visible (green)
- 10-9 m = 1 nm => x-ray
- frequency f
- number of peaks per second passing us
- Period P is the time between peaks
- speed of wave