Intensity: - the energy transferred per second per unit area.
Amplitude (A): - The size of the oscillation measured from the midpoint to the maximum oscillation.
Wavelength (λ): - the length of the wave measured from maximum to maximum, crest to crest, trough to trough, compression to compression, rarefraction to rarefraction.
Intensity α (Amplitude)2
Wavefront: - A wavefront is a line of crests
Ray: - A ray is a narrow band of wavefronts
Compression: - In a longitudinal wave when the medium is squeezed together we call it compression.
Rarefraction: - In a longitudinal wave when the medium is spread out we call it rarefraction.
Frequency (f) - the number of waves produced per second. Unit is Hz
Period (T): - the time taken to produce a single complete wave. Unit is second

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