Physics

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Properties of Materials

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Physics E.M. Sprectrum

Increasing Wavelength

g

X-Rays

Ultra-Violet Rays

Violet

Indigo

Blue

Green

Yellow

Orange

Red

Radio Waves

Properties

They can be reflected or refracted.

They all obey the wave equation

Velocity= Frequency x Wavelength

They transfer energy from one place to another.

All travel at the speed of light (3x10^8 ms^-1 in air and a vacuum. They will slow down when travelling through water or glass.

They are transverse Waves.

They can travel through Vacuum.

2 Kinds of Radiation emitted from electromagnetic rays

Ionising radiation

Are harmful and can damage living cells and tissues

Non-ionising radiation

Non harmful radiation which would not harm living cells and tissues

Increasing Frequency

Radio waves

Radio and television communication

Microwaves

Radar communication , Microwave cooking

Infra-red

Intruder alarms, Remote control of electrical appliances , Radiant heater

Visible Light

Photosynthesis, Lasers for medical , industrial and surveying

Ultra-violet Rays

Sunbeds , Forgery detection

X-rays

Airport Security, Medical/Dental inspections, Analysis of crystal structure

Gamma Rays

Treatment of cancer, Sterilising equipment

Effects of E.M. Waves

Infrared heating

Our skin absorbs the infrared waves which makes us feel warm. The source of this heat can be seen like the red colour of a hot charcoal.