## The Nature of Waves

##### Created by:

caitlinrjohnston  on March 31, 2012

June 2012

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# The Nature of Waves

 Where does a wave transfer is energy?Away from the source
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#### Definitions

Where does a wave transfer is energy? Away from the source
Displacement, X How far from a point on the on the wave has moved from it's undisturbed position.
Amplitude, a Maximum displacement, metres.
Wavelength, λ The length of one whole wave, from crest to crest or trough to trough, metres
Period, T The time taken for a whole vibration, seconds
Frequency, f The number of vibrations per second passing a given point
Phase Difference The amount by which one wave lags behind another wave. Measured in degrees or radians.
Reflection The wave is bounced back when it hits a boundary
Refraction The wave changes direction as it enters a different medium
What is intensity? The rate of flow of energy per unit area at right angles to the direction of travel of the waves
What is intensity proportional to? The square of the amplitude of the wave
What is the unit of frequency? 1 Hz = 1 s₋¹
What is the equation for wave speed? Speed (v) = Distance moved (d) / time take (s)
What is the wave equation? Speed of wave (v) = Wavelength (λ) x Frequency (f)

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