pt2 of physics

• Refraction


  A change in the direction of wave such as light, caused when it enters a material of different density
• Frequency


  The number of waves per second
• Amplitude


  The height of the wave above the zero line
• Superposition

  The overlapping of waves to give a combined effect
• Crest


  The point on a wave that exhibits the maximum amount of positive or upward displacement from the rest position
• Trough


  The opposite of a crest, the minimum or lowest point in a cycle
• Electromagnetic


  Electric currents or fields and magnetic fields
• Wave


  They transfer energy from one place to another without the need of particles
• Wavelengths


  The distance from peak to peak
• Types of waves


  • Light waves are transverse, they go up and down
  • Sound waves are longitudinal, they move side to side
• Light waves


  • Are electromagnetic and do not need a medium to travel through (no particles)
• Water waves


  • Are mechanical, they need a medium to travel (water particles)
• Sound waves


  • Are mechanical and need a medium to travel (air particles)
• Light waves


  • Light travels in straight lines, it cannot bend or turn, light travels through a vacuum, the empty that light can pass through are vacuums, they are electromagnetic waves