Source, detection and also application

Electromagnetic waves carry energy. The tide inter-base.netnsist that transverse vibrations in electrical and magnetic fields, not vibrating particles.Electromagnetic waves execute not need matter to travel through - they can travel through empty room (a vacuum).In a vacuum, every electromagnetic waves take trip at \(3 \times 10^8m\,s^-1\) - the fastest speed possible.

The table below demonstrates the electromagnetic spectrum.

The electromagnetic spectrumType the waveTypical sourceExample the detectorApproximate wavelengthTypical usersDangers of end exposure
Radio: LW, MW and also VHFelectronic circuitsaerial1km, 100m and also 1minter-base.netmmunications, radio, TVsafe (unless an extremely inter-base.netncentrated)
Microwaveselectronic circuitsaerial1cm \<(10 ^-2m)\>inter-base.netmmunications satellites, telephony, heater water and also foodburning, if inter-base.netncentrated
Infra red (IR)electronic devices, warmth objects, sunelectronic detectors, heat-sensitive papers, black-bulb thermometer0.1mm \<(10 ^-4m)\>detector in security lighting, remote inter-base.netntrols (e.g. TV)burning, if inter-base.netncentrated
Light; Red, Orange, Yellow, Green, Blue, Indigo, Violetelectronic gadgets (eg LED), suneye, photographic film, digital inter-base.netmponents (eg LDR)0.001mm \<(10 ^-6m)\>seeing, photography, inter-base.netmmunication (eg in optical fibres), laser surgeryburning, remote if inter-base.netncentrated
Ultraviolet (UV)sun, gas discharge, lampscauses fluorescence (glowing) in part objects, film0.00001mm \<(10 ^-8m)\>sun-tan lamp, making ions, do vitamin D, killing bacteria in water therapy plantssunburn, skin cancer, retinal damage
X-raysvery quick electrons hitting a steel targetphotographic film\<10^-10m\>imaging breaks/defects in bones, surprise devicescell destruction, cabinet mutation, cancer
Gamma rays (\<\gamma\>)radioactive nuclei decayingphotographic film, GM tube\<10^-12m\>medical tracers, death cancerous cells, sterilisation of operation equipmentcell destruction, cabinet mutation, cancer

Chart showing varieties of electromagnetic tide from radio come gamma rays, v visible spectrum illustrated.Chart showing species of electromagnetic tide

The electromagnetic spectrum arrays from long wavelength, short frequency waves (like radio waves which can be offered for inter-base.netmmunication) to quick wavelength, high frequency waves (like gamma light ray which deserve to be used for clinical treatment).

In the electromagnetic spectrum, waves with higher frequency have actually greater power than lower frequency waves.