The EM spectrum

when are x-rays are emitted + why

when electrons within an atom go through energy changes

• electrons in lower energy levels absorb energy —> move to higher energy level

• when electron return to lower energy level, electron lose energy as radiation. (need to lose large amount —> emit as x-ray radiation of high energy)

how are radiowaves produced

by electrons oscillating in circuits

• oscillations = current that continually change direction(AC)

• current flows up and down aerial

• generates radiowaves in air around aerial

• frequency of radio corresponds to oscillation frequency

uses of x-rays

• medical diagnosis(find broken bones, damage to lungs)

• radiotherapy

• treatment of cancer

• airport security

• revealing counterfeit art

uses of radiowaves

• broadcasting TV + radio

• communications

• satellite transmissions

• phones

• radar