Nosocomial Infections: Definitions Nosocomial Infections: Definitions
Wave Definitions
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Transcript of Wave Definitions
Wave Definitions
• Elastic Medium
A medium that allows for the transfer of waves by acting as if it were an array of particles connected by springs with each particle having an equilibrium or rest position.
• Disturbance
A build up of energy in a system which allows for the propagation of a wave.
Pulse
• A single non-repeated disturbance.
Crest and Trough
• A crest is region of upward displacement in a transverse wave.
• A trough is an area of downward displacement in a transverse wave.
Compression and Rarefaction
• A compression is the area of a longitudinal wave where the particles are closer together than the equilibrium position.
• A rarefaction is the area of a longitudinal wave where the particles are farther apart than the equilibrium position.
Phase
• Phase is used to describe the position and direction of motion of a particle on a wave.
• Two particles are in-phase if they have the same displacement and are moving in the same direction.
• Two particles have opposite phase if they have opposite displacements and are moving in opposite directions.
Wavelength
• Wavelength is the distance between any two consecutive points on a wave that are in-phase.
• The example to the left is only for transverse waves.
Frequency and Period
• Frequency is the number of oscillation or waves that occur per unit time.
• Period is the amount of time that passes as one complete wave passes a given point.
Speed
• Speed is the time rate of motion for a wave.
Speed = Wavelength • Frequency
Amplitude
• Amplitude is the maximum displacement in the y direction.
• The amplitude of a wave is an indication of the wave’s energy.