waves

• what type of wave is the ripples on a water surface?

  transverse
• what type of waves show areas of compression and rarefraction?

  longitudinal
• what type of wave are sound waves travelling through air?

  longitudinal
• what is moving when a ripple is on a water surface?

  the wave not the water
• what is moving when sound is travelling through air?

  the wave not the air
• what is the max displacement of a wave from its undisturbed position?

  amplitude
• what is distance from one point on a wave to the equivalent point on the next wave?

  wavelength
• what is number of waves passing a point each second?

  frequency
• what is equation to work out the period of a wave?

  period = 1/frequency
• what is standard unit for frequency?

  Hz (hertz)
• what word describes speed at which energy is transferred through a medium?

  wave speed
• what is equation that links frequency, wavelength and wave speed?

  wave speed = frequency x wavelength
• what type of waves are electromagnetic?

  transverse
• what is the relation of the speed of the different electromagnetic waves through a vacuum?

  they’re the same
• what type of electromagnetic wave has the lowest frequency?

  radio waves
• what type of electromagnetic wave has highest frequency?

  gamma rays
• what type of electromagnetic wave has longest wavelength?

  radio waves
• what type of electromagnetic wave has shortest wavelength?

  gamma rays
• what is the electromagnetic spectrum in order of longest to shortest wavelength?

  radio waves - microwaves - infrared - visible light - ultraviolet - xrays - gamma rays
• what part of electromagnetic spectrum can our eyes detect?

  visible light
• what word describes change in direction of a wave that travels from one medium to a different one?


  refraction
• what part of the electromagnetic spectrum can be produced by oscillations in electrical circuits?

  radio waves
• when radio waves are absorbed what can they create?

  an alternating current
• where do gamma rays originate from?


  change in an atoms nucleus
• what parts of electromagnetic spectrum can have hazardous effects?

  ultraviolet waves, x-rays, gamma rays
• what can effect the hazardous effects that radiation can have on the body?

  type of radiation and size of dose
• what is radiation dose measured in?

  sieverts
• what is a measure of the risk of harm from an exposure of body to the radiation?

  radiation dose
• what part of spectrum can cause skin to age prematurely and increase skin cancer risk?

  ultraviolet
• what parts of spectrum can cause mutation of genes and cancer?

  xrays and gamma rays
• what are the practical applications of radio waves?

  television and radio
• what are practical applications of microwaves?

  satellite communications and cooking food
• what are practical applications of infrared?

  electrical heaters, cooking food, infrared cameras
• what are the practical applications of visible light?

  fibre optic communications
• what are practical applications of ultraviolet?

  energy sufficient lamps and sun tanning
• what are practical applications of x-rays?

  medical imaging and medical treatments
• what are practical applications of gamma rays?

  medical imaging and medical treatments