P12 Electromagnetic waves

carrier waves

Waves used to carry any type of signal

charge-coupled device (CCD)

An electronic device that creates an electronic signal from an optical image formed on the CCD's array of pixels

contrast medium

An X-ray absorbing substance used to fill a body organ so the organ can be seen on a radiograph

electromagnetic spectrum

The continuous spectrum of electromagnetic waves

microwaves

Electromagnetic waves between infrared radiation and radio waves in the electromagnetic spectrum

optical fibre

Thin glass fibre used to transmit light signals

radiation dose

Amount of ionising radiation a person receives

radio waves

Electromagnetic waves of wavelengths greater than 0.10m

ultraviolet radiation (UV)

Electromagnetic waves between visible light and X-rays in the electromagnetic spectrum

wave speed

The distance travelled per second by a wave crest or trough

white light

Light that includes all the colours of the spectrum

X-rays

Electromagnetic waves smaller in wavelength than ultraviolet radiation and produced by X-ray tubes