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By Will B. Electromagnetic waves The different waves that make up the electromagnetic spectrum are as follows in order of increasing frequency; Radio.

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Presentation on theme: "By Will B. Electromagnetic waves The different waves that make up the electromagnetic spectrum are as follows in order of increasing frequency; Radio."— Presentation transcript:

1 By Will B

2 Electromagnetic waves The different waves that make up the electromagnetic spectrum are as follows in order of increasing frequency; Radio -> Microwave -> Infrared -> Light -> Ultraviolet -> X-ray -> Gamma. All these waves can travel through a vacuum. They are also all transverse waves.

3 Radio Waves Has a frequency of 10 3 – Hertz Has a wavelength of 10 5 – Radio waves will be reflected and refracted by the ionosphere as it is electrically charged. Radio waves main uses are radio and television broadcasts. Radio waves can produce a chosen frequency, so they won’t interfere with other radio waves. This allows for more than one radio station to broadcast in an area.

4  Have a frequency of 10 3 to hertz  Have a wavelength of 10 5 to metres  Microwaves are not reflected by the ionosphere and so are used for communications with satellites.  Microwaves have shorter wavelengths, this makes them ideal for handheld communication devices such as mobile phones.

5  Has a frequency of to hertz  Has a wavelength of to  They use total internal reflection to be carried along optical fibres.  They are responsible for heat radiation, when you feel warmth from a bonfire, it is because infrared waves carry the heat.  Infrared waves are also used in toasters and grills to cook food.

6  Human eyes can detect electromagnetic wavelengths from about 400nm (violet) to 700nm (red).  Visible light can be totally internally reflected within glass.  This allows images to be transported directly from one place to another.

7  Has a frequency ranging from 7.5 x 1014 to 3 x 1016 hertz.  Has a wavelength 10-6 to 10-9  Some ultraviolet waves are used in the treatment of sewage to kill bacteria.  To much exposure to ultraviolet waves can cause sunburn in humans.

8  Has a frequency of to  Has a wavelength of to  Very high energy electromagnetic waves can be produced by colliding high speed electrons with a metal target. When these electrons decelerate rapidly, they give off energy as x-rays.

9  Has a frequency of 1017 to 1024  Has a wavelength of 10-9 to  Generated by energy shifts inside the nuclei of atoms, gamma rays form the very highest energy EM waves.  Used to sterilise surgical instruments  Gamma rays can be used to kill cancerous cells in the body.


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