Flashcards
Light and Sound
Cards in this deck (15)
- 1Transverse WavesCan propagate in a vacuum- don't need particles.
In a transverse wave, the wave motion is at right angles to the direction of the wave. The energy flows in a direction at right angles to the wave motion.
Examples of a transverse wave are light, pond-ripples, seismic S-waves - 2Longitude WavesNeeds particles unlike transverse waves
In a longitude wave, the wave motion is along the direction of the wave. It consists of a series of compressions and rarefactions. The Energy flows in the same direction as the wave motion.
Examples of longitude waves are sound, seismic P-waves - 3AmplitudeThe amplitude of a wave is the maximum displacement of the particles from their equilibrium position.
- 4Wave SpeedSpeed is the rate of change of distance of the wave.
V=f - 5WavelengthThe distance between two adjacent crests, or two adjacent troughs. Or the distance between two adjacent points on a wave that are in the same phase of motion
- 6FrequencyThe number of waves passing a point in 1 second, or the number of oscillations of a particle or the source in 1 second
f=v/ - 7Time PeriodThe time for one complete wave to pass a point or the time for one complete oscillation of a particle
T=1/f - 8RefectionThe angle of incidence is equal to the the angle of reflection
- 9RefractionRefraction is the change of direction that occurs when waves enter, at an angle other than 90, a medium in which it travels at a different speed
- 10Refractive IndexRefractive index is the ratio of the angle of incidence so the sine of the angle of refraction (Snell's Law) or the ratio of the speed of light in air or a vacuum to the speed of light in the medium. or the ratio of the real depth to the apparent depth
- 11Critical AngleThe critical angle occurs inside the more dense medium and is the angle of incidence, at which the angle of refraction is 90, i.e along the boundary between the mediums
- 12Total Internal ReflectionTotal Internal Reflection occurs at angles greater than the critical angle inside a more dense medium
- 13DiffractionDiffraction is the spreading out of waves as they pass through a gap. The narrower the gap is the more diffraction there is.
- 14DispersionDispersion is the splitting of light into the colours of the spectrum, due to the different speeds at which these colours travel in the prism
- 15MonochromaticMonochromatic means of one frequency. Therefore if monochromatic light is passed through a triangular prism dispersion will not occur
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- Fourth year Physics Flashcards on Light and Sound, created by Hannah McDonald on 09/11/2016.
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- Hannah McDonald
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