Lesson 4 Nature and Types of waves

• described as any disturbance or oscillation that comes from a source.

  Wave
• What is carried when waves travel

  Energy
• caused by the vibrations of the earth

  Seismic waves
• a combination of longitudinal and transverse waves and are surface waves.

  Water waves
• longitudinal waves that travel through a medium like air or water

  Sound waves
• waves that are created as a result of vibrations between an electric field and a

  magnetic field.

  electromagnetic waves
• a material that is

  instrumental for the disturbance to move

  Medium
• It require the presence of matter for them to travel.

  Mechanical wave
• does not need medium to transfer energy

  Electromagnetic wave
• a volume empty of matter,

  sometimes called 'free- space'

  vacuum
• A simple disturbance


  wave pulse
• Series of disturbances


  Wave train
• When the direction of the vibration of the particles is parallel to the direction of the wave propagation.

  Longitudinal wave
• Two types of longitudinal wave

  Compression, Rare faction
• are those that put the coils closer together

  compression
• Expansions are areas where the coils are farther apart. Expansions are also termed as

  Rarefaction
• When the direction of the vibration of the particles is perpendicular to the direction of the wave propagation

  Transverse wave
• The highest part of a transverse wave.

  crest
• The lowest part of a transverse wave.

  Through
• The distance between one crest and the next in a transverse wave.

  Wavelength
• The height from the resting position to the crest of the transverse wave.

  amplitude
• The number of complete wave cycles

  Frequency
• What is frequency measured in?

  Hertz