Light Light is a form of energy Energy has the ___________ to do _________ Light travels in ________________ These waves travel in a __________ ________

Light and sound travel as waves Waves can be described by their___________, _____________ and _______________.  

Amplitude The amplitude of a wave is its _________________________________________ The amplitude of a light wave is its _____________ The amplitude of any electromagnetic wave is its ____________.

Wavelength The wavelength of a wave is the distance between a point on one wave and the same point on the next wave, eg. ______ to ______ Wavelength of visible light is it’s _________. R O Y G B I V

Colour RED has the ______________ wavelength. Violet has the _____________wavelength. Outside of these limits “light” would be invisible to the eye.

Electromagnetic radiation Wave length determine what type of wave it is. From long to short they are: Radio waves, microwaves, heat waves, visible light, ultraviolet, x-rays, gamma rays.

Shorter waves Carry more ________and can _____________ through stuff. But they can’t travel very ______. Long waves carry ________energy, they can’t penetrate stuff. But they can _______________.

Frequency The frequency of a wave is The ________ of waves passing by in __________ The _______ of frequency is the __________(__) Frequency and wavelength are related. Shorter wavelength mean _________ frequencies. Longer wavelengths mean _________ frequencies

Transverse waves Light and the electromagnetic spectrum use these wave. Because they are not made of vibrating particles they can ______________________. They do not need a medium. So they _______through ____________. They are very fast __________________in the air

Compression or longitudinal waves Sound waves are like this. Compression waves must travel through a substance (_____________________) called a medium. One _________ hits another _________, which hits another, passing___________along. Because sound waves depend on moving objects (molecules) they are ___________________. Less than _________________in the air

This is why you see the lightening Before you hear the thunder