1. Electromagnetic spectrum is the name of a bunch of types of radiation organized by the amount of energy they carry.
Radiation is any kind of movement of energy though space.
Radiation can be a wave or a particle

2. Energy level Radio Waves: lower energy:
Radio / TV signal – mobiles - from stars
Microwaves: microwaves to heat food – radar signal
Infrared waves: radiating heat
Visible light
Ultraviolet waves: sunlight
X-rays: high penetration power, pictures of bones
Gamma-rays: from space – nuclear reaction

3. Electromagnetic Spectrum

5. The diagram shows a section of the electromagnetic spectrum
How do the frequency and the speed of gamma rays compare
with those of visible light?

6. Properties They are produced when atoms or electrons lose energy.
They can all be reflected and refracted.
They are all transverse waves.
They can travel through a vacuum.
They all travel in a vacuum at a speed of m/s (3 x 108 m/s). Their speed in air is almost the same as this.

7. Infrared

8. Visible light Light coming from the sun is called white light
White light is not a pure colour, it is a mixture of all the different colours making up the visible spectrum.
The separating of white light into its component colours is called dispersion.

9. Visible light, made up of 7 colours:
Red
Orange
Yellow
Green
Blue
Indigo
Violet R O Y G B I V

10. X-rays

11. Light coming form the sun is __________ light.
It is not a _______ colour but a ___________ of all _________ colours, making up the __________.
The ___________ light can be separated into __________ of colours
The visible spectrum is part of the ________ spectrum that our _______ are able to detect.
The separation of white light into colours is called __________.