3rd QTR L2 GR7

• are vibration/disturbance that propagates in a medium or in a vacuum that carries energy

  wave
• unrepeated disturbance is called

  wave pulse
• succession of periodic disturbances is called

  wave train or periodic waves
• types of electro-magnetic waves

  radiowave, microwave, infrared, visible light, ultraviolet, X-rays, gamma rays
• waves can be described in 5 terms which are


  frequency, period, wavelength, velocity or speed and amplitude
• The number of waves produced per unit of time

  Frequency
• how often the particles of a medium vibrate when a wave passes through it

  frequency
• its unit is hertz Hz


  frequency
• the time it takes one complete cycle of the wave to pass a reference point

  period
• it is a measure of time


  period
• expressed in units of time; seconds

  period
• the distance between any two successive points that are in phase with each other in a wave

  wavelength
• The distance traveled by a wave per unit of time

  speed
• may obtained as frequency or wavelength

  speed
• refers to the maximum amount of displacement of a particle on a medium from its resting position

  amplitude
• the medium or the channel moves perpendicular to the direction of the wave

  transverse wave
• the particles move up and down as the waves move horizontally

  transverse wave
• the medium or channel moves in the same direction with respect to the wave.

  longitudinal wave
• the movement of the particles is from left to right and forces other particles to vibrate

  longitudinal wave