Light Waves Notes. Laser. Part 1 – Properties of Light. Light travels in straight lines:. Light travels VERY FAST – around 300,000 kilometres per second. At this speed it can go around the world 8 times in one second.
Thunder and lightning start at the same time, but we will see the lightning first.
Light Bulb (when on)
A pair of purple trousers would reflect purple light (and red and blue, as purple is made up of red and blue):
Primary Colours of Light
Secondary Colours of Light
Due to change in medium, the phase velocity of the wave is changed but its frequency remains constant (the same).
Independent— wavelength does not affect loudness.
Inversely proportional—high frequency = short wavelength,
low frequency = long wavelength