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Ultraviolet (UV) radiation can cause eye damage, which is why most sunglasses can absorb UV, preventing it from reaching the eye. The intense UV emitted by the Sun is absorbed by your skin and can cause sunburn or even damage DNA in your body cells – which could lead to skin cancer.

Radio waves have the longest wavelengths of all EM waves. Radio waves have wavelengths ranging from thousands of metres down to around 30 cm. This means they can easily travel around large objects, like hills, mountains or buildings.

Electromagnetic waves travel at an extremely high speed: the speed of light. The speed of light in a vacuumclosevacuumEmpty space, where there is no solid, liquid or gas present. is around 300,000,000 metres per second. At that speed, light can travel 7.5 times around Earth in just one second.

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X-rays can also damage DNA in body cells, which could lead to cancers developing inside the body. For low levels of exposure (eg a few medical x-rays per year) this is not a significant problem, but radiographers and other people working with X-rays must take precautions to reduce this risk.

A mnemonicclosemnemonicA pattern of letters, words, ideas or associations which help with memorising something. is often used to help remember the electromagnetic waves in the correct order.

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X-rays have wavelengths which are approximately one millionth of a millimetre. They pass easily through soft tissues, but are absorbed by bone. X-rays are small enough to enter cells and can damage DNA, which can cause cancers to develop in the body.

Although electromagnetic waves have many uses, they can also be dangerous. Different types of EM wave can be dangerous in different ways.

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Microwaves have wavelengths between around 30 cm and 1 mm. This means they are easily absorbed by fat and water molecules, heating them up.

There are lots of examples of electromagnetic wavescloseelectromagnetic wavesA group of transverse waves which travel at the speed of light, including radio waves, microwaves and visible light. around us, including light waves, radio waves and infrared radiation. These electromagnetic waves are caused by vibrating electric and magnetic fields and they are transverse wavesclosetransverse waveA wave in which the particles move up and down at right angles to the direction it travels in, like an ocean wave or lifting a rope up and down., because the vibrations of these fields are at right angles to the direction the wave travels.

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This is a sentence that can remind you of the first letter of each type of wave, in order of increasing frequencyclosefrequencyFrequency is the number vibrations of the wave in one second, also seen as the number of complete waves passing a point in one second. Frequency is measured in hertz (Hz). – for example:

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This is the only type of electromagnetic radiation which is visible to the human eye. As well as allowing people to see the world around them, visible light has a range of other uses, including forming images in cameras and video cameras. Concentrated visible light emitted by laserscloselaserA device which produces a narrow beam of concentrated visible light. The word laser is an acronym, which stands for Light Amplification by Stimulated Emission of Radiation. can be used to send internet and telephone signals along optical fibres. Lasers can even be used in surgery, and to cut materials like wood and metals in a laser cutter.

Infrared waves have wavelengths which are approximately 1 millimetre or up to one thousand times smaller. Infrared waves are easily absorbed by dark, matt objects and have a heating effect.

Like X-rays, gamma rays can also damage DNA in your body cells which can lead to cancers developing inside the body. People working with radioactive substancescloseradioactiveSubstances which emit dangerous nuclear radiation, like uranium or plutonium. which emit gamma rays must limit the amount of gamma radiationcloseradiationSomething which spreads out (radiates) like sound, and light or other EM waves. The term radiation is sometimes used in place of waves – e.g. light radiation or infrared radiation. they are exposed to, by wearing protective clothing and restricting the time they work near these materials.

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X-rays are commonly used to produce medical images of broken bones, because they can pass through body tissues but are absorbed by bones. They are used to sterilise medical equipment, killing any bacteria present before the instruments are used for surgery. X-rays are also used in airport security scanners and to detect broken pipes underground.

Ultraviolet waves have wavelengths which are a bit shorter than visible light waves. They are small enough to damage DNA in skin cells, which can cause skin cancer.

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Each region of the electromagnetic spectrum has a range of wavelengths associated with it. The range of wavelengths affects the way each type of EM wave behaves and interacts with matter.

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Infrared (IR) waves are emitted by all warm objects, and they are used for heating and to cook food in ovens, grills and toasters. They are also used for communication, including remote controls for televisions and stereos, as well as sending internet and telephone signals along optical fibrescloseoptical fibresA thin piece of glass or plastic, which is used to transmit internet and telephone signals.. Infrared waves can also be detected by infrared cameras, so are often used by night vision camerasclosenight vision cameraA special camera which detect infrared waves, to produce images when there is very little light. or thermal imaging camerasclosethermal imaging cameraA special camera which can detect infrared waves, to produce images which show the temperatures of objects, or of different parts of an object. in police helicopters – which can detect the infrared waves emitted by people and animals.

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Radio waves are used for sending radio and television signals. They are also used to control radio-controlled toys, like cars, boats and aeroplanes. We even use radio waves in astronomy, to find out about distant stars and galaxies by studying the radio waves they produce.

Because microwaves have a heating effect, some powerful microwaves can be dangerous. Your microwave oven will not switch on if the door is open, to prevent the microwaves causing damage to the cells in your body by heating them.

Gamma rays are also used to produce medical images and to sterilise medical instruments, in a similar way to X-rays. They are also used to sterilise food, killing bacteria in fresh fruit and vegetables to increase their shelf life. Gamma rays can also be used to detect and even to treat cancer.

Ultraviolet (UV) waves are used in forensic sciencecloseforensic scienceThe use of scientific techniques to help find evidence of a crime. to help detect forged documents, like fake banknotes, passports or driving licences. Ultraviolet waves can be absorbedcloseabsorbTo take in, and not reflect or transmit waves (eg light). by some materials, like fluorescent inks in highlighter pens, making them glow brightly. They are also used to disinfect water, by killing bacteria.

You would need a row of around 10 million gamma waves to fill a one millimetre gap. Gamma rays are small enough to enter cells and can damage DNA, which can cause cancers to develop in the body.

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Some animals can detect infrared, including many species of snake, and this helps them to hunt their prey. Some insects, birds and even reindeer can see ultraviolet rays which leads them to their food source.

As well as heating food in microwave ovens, microwaves are used for communication. For example, mobile phones, and wireless internet (Wi-Fi) devices like laptop computers all use microwaves to communicate. Microwaves are also used for sending satellite signals, eg for GPScloseGPSGlobal Positioning System – a network of satellites used by satellite navigation systems. systems or satellite television.