Light and the electromagnetic spectrum

transverse waves that travel at the same speed in a vacuum. they transfer energy from a source to observer

Radio, micro, infra-red, visible, ultra-violet, x-ray, gamma

red, orange, yellow, green, blue, indigo, violet

from radio to gamma waves in order of decreasing in wavelength and increasing in frequency

visible light but a limited range of frequencies of electromagnetic radiation

Their potential danger increases too

Internal heating of body cells

Causes skin burns

Damages cell surfaces and eyes leading to cancer and eye conditions

Mutate and damage cells in the body

Broadcasting, communications and satellite transmissions

cooking, communications, satellite transmissions

cooking, thermal imaging, short range communication, television remote controls and security systems

vision, photography and illumination

security marking, sun beds, detecting fake money and disinfecting water

observing internal structures, security and medical

Sterilising food and medical equipment, detecting and treating cancer

By vibrations in electrical circuits

Generate radiations over a wide frequency range, which is caused by absorption of a range of radiations - they produce electromagnetic radiation.