Topic 4.4: Wave Characteristics Flashcards Preview

IB SL Physics > Topic 4.4: Wave Characteristics > Flashcards

Flashcards in Topic 4.4: Wave Characteristics Deck (14):
1

• 4.4.1: Describe a wave pulse and a continuous progressive (travelling) wave

o OSCILLATIONS: A repeated back and forth motion.
o CYCLE: One complete oscillation.
o TRAVELLING WAVE: A disturbance moving from a source and transferring energy from one point to another.

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• 4.4.3: Describe and give examples of transverse

o Transverse Waves: Where the disturbance is at right angles to the direction of travel of the wave.
 Cannot be propagated in gases
 Examples:
• Light waves

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4.4.3: Describe and give examples of longitudinal waves

o Longitudinal Waves: Where the disturbance is parallel to the direction of travel of the wave.
 Examples:
• Sound waves

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Define wavefronts

o WAVEFRONT: A line of surface which joins all points which have the same displacement at the same moment (they are all in phase).

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Define rays

o RAY: A line at right angles to the wavefronts which shows the direction of energy travel of the wave.

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Describe crest and trough

o CREST AND TROUGH: For a transverse water wave, the maximum and minimum displacements.

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Describe compression and rarefraction

o COMPRESSION AND RAREFACTION: For a longitudinal wave, points of maximum and minimum density of the medium.

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Define displacement

o DISPLACEMENT: The distance of the disturbance measured from its equilibrium position.

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Define amplitude

o AMPLITUDE: The maximum displacement from the equilibrium position

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Define frequency

o FREQUENCY: The number of oscillations completed in a second (hertz)

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Define period

o PERIOD: The time taken for an oscillation. f=1/T; T=1/f

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Define wavelength

o WAVELENGTH: The distance between consecutive points on the wave which are in step (ie in phase)

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Define wave speed

o WAVE SPEED: The speed of travel of the energy of the wave.

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Define intensity

o INTENSITY: The rate of flow of energy through unit area perpendicular to the direction of travel of a wave. Unit: Wm-2