# Physics Light and Waves Deffinations

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Longitudinal wave
Particle motion is parallel to the direction of energy transfer/flow.
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Transverse wave
Particle motion is perpinduclar to the direction of energy flow/transfer.
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Doppler Effect
A moving source of sound is observed by a stationary observer. As the sound source moves the wavelength of the waves in front reduce, and the wave lengths of the waves behind increase.
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Red Shift
Light from galaxies can be analysed as it passes through a diffraction grating. The spectral lines were shifter towards the red end of the spectrum. Red shift of the lines is because distant galaxies are moving away from earth at very high speeds.
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Aproaching Formula
Vw-Vs
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Receding Source
Vw+Vs
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Superposition of Waves
When two waves pass each other they will intefere with each other. Causing interference patterns, constructive and Destructive.
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Youngs Interference- d
Distance Between Sources
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Youngs Interference-L
Length between sources and screen
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Youngs Interference-x
Distance between central maxima and fringe
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Youngs Relationships-d gets smaller
x increases
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Youngs Relationships-more lines are introduces
Fringes get slightly brighter
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Standing Wave
Created by the interference of two identical waves moving through each other in opposite directions. Stays in the same position and oscillates up and down. Amplitude is twice that of the original.
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Beat Frequency
Beating is a regular change in the loudness of a note that is produced when two sources of almost identical frequency interfere.
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## Other cards in this set

### Card 2

#### Front

Particle motion is perpinduclar to the direction of energy flow/transfer.

Transverse wave

### Card 3

#### Front

A moving source of sound is observed by a stationary observer. As the sound source moves the wavelength of the waves in front reduce, and the wave lengths of the waves behind increase.

### Card 4

#### Front

Light from galaxies can be analysed as it passes through a diffraction grating. The spectral lines were shifter towards the red end of the spectrum. Red shift of the lines is because distant galaxies are moving away from earth at very high speeds.

Vw-Vs