Electromagnetic spectrum
The following is the text of a foundation level worksheet that I use to reinforce the learning of the electromagnetic spectrum.
White light can be split up into a spectrum of different colours. There are many other types of radiation beyond the ends of the visible spectrum. Each type of radiation in this extended spectrum - known as the electromagnetic spectrum - has its own special properties and uses.
When rays of light pass through prisms their direction may be changed. When white light is used, a spectrum is produced. The spectrum is produced because white light is made up of many different colours. Different colours of light are refracted (bent) by different amounts. Complete the following diagram accurately to show what happens. Show which colour is refracted through the biggest angle and which is refracted the least.
Light is one type of electromagnetic radiation. All types of electromagnetic waves travel at the same speed through space. This is the speed of light. The various types of electromagnetic radiation form a continuous spectrum extending far beyond each end of the visible spectrum. The whole spectrum is called the electromagnetic spectrum. Now put the members of the electromagnetic spectrum into the correct order starting with the shortest waves:Incorrect order: visible light; X-rays; microwaves; radio waves; gamma rays; ultra violet; infra red.
Match the type of radiation with the effect on living cells (2 will be matched with the same box):
MICROWAVES
|
Pass through soft tissues although some is absorbed. High doses kill normal cells, lower doses can cause cancer.
|
INFRA RED
|
Absorbed by skin and detected as heat.
|
ULTRA VIOLET
|
Passes through skin and is absorbed by the tissues below. Darker skin allows less penetration and therefore provides more protection. High doses kill normal cells, lower doses can cause cancer.
|
X-RAYS
|
Absorbed by water in cells where the heat released may damage or kill cells.
|
GAMMA RAYS
|
|