P1

Cards (17)

  • Radiation transfers energy from one place to another
  • All waves on the electromagnetic spectrum travel at the speed of light
  • Radio waves have a long wavelength and low frequency
  • gamma rays have short wavelength and high frequency
  • Electromagnetic spectrum - radio waves, microwaves, infrared radiation, visible light, ultra violet radiation, x-rays, gamma rays
  • Radiation can be - reflected (bounce off surface), absorbed (cause heat), transmitted (pass through)
  • Ionising radiation - some forms of radiation transfer enough energy to remove electrons from atoms forming unstable ions which can cause mutations leading to cancer
  • All objects absorb and emitt electromagnetic radiation, the higher the temperature of a body/object, the higher frequency
  • Wave - transfers energy in the direction the wave travels without transferring matter.
  • Transverse wave - waves that oscillate at right angles to the direction of energy transfer
  • wave speed (m/s) = distance (m) / time taken (s)
  • Amplitude - distance from one wave crest to another
  • Frequency - number of complete waves per second (Hz)
  • wavelength - time taken for a wave to complete wave to pass a given point
  • electromagnetic waves - transverse waves that transfer energy emitted from a source
  • Reflection - light waves are emitted from a light source and transmitted through the air. Light bounces off surfaces and is reflected
  • refraction - waves change direction as they pass from one medium to another. They travel at different speeds through different mediums. Higher density = slower the wave speed