SCIENCE REVISION

SCIENCE REVISION

1. The Electromagnetic Spectrum

   • Microwaves
     • The typical use of Microwaves is cooking
     • The danger is that they can cause internal heating to body tissues
   • Infra-Red Waves
     • The typical use of Infra-Red is optical fibre communication
     • The danger would skin burn
   • Radio Waves
     • The typical use of Radio waves is television signals
     • Large doses of Radio waves are believe to give cancer and leukaemia
   • Gamma Rays
     • The typical use of Gamma Rays is to kill cancer cells
     • The danger with Gamma Rays is they can penetrate the skin and damage the cells inside
   • X-Rays
     • The typical use of X-rays is to see the medical image of the bones
     • The danger with X-rays is the radiation exposure
   • Ultra-Violet Rays
     • The typical use is Sunbeds
     • The dangers would be sunburn, suntan, pigment darkening and erythema
   • Visible Light
     • The typical use is to see things
     • The danger is they can damage the retina in your eyes

2. Longitudinal And Transverse Waves

   • Longitudinal Waves
     • Longitudinal waves are waves in which the the displacement of the medium is in the same direction as, or the opposite direction to, the direction of the travel wave.
     • Longitudinal waves are sound waves
   • Transverse Waves
     • Transverse waves are water waves
     • A transverse wave is a moving wave that consists of oscillation occurring perpendicular to the direction of energy transfer.