Fichas
Waves
Fichas del conjunto (44)
- 1What is a Transverse wave?Waves in which the direction of vibration is perpendicular to the direction in which the waves travels
- 2What is a longitudinal wave?Waves in which the direction of vibration is parallel to the direction in which the wave travels
- 3What type of waves can be polarised?Transverse waves
- 4What is the displacement of a wave?Is its distance from the equilibrium position
- 5What is the amplitude of a wave?The maximum displacement of a vibrating particle
- 6What is a period of a wave?The time for one complete wave
- 7What is the 'Phase difference' between two particles?The fraction of cycle
- 8What is superposition?When two waves meet they will 'superimpose'
- 9What type of superposition will two crests form?Constructive
- 10What type of superposition will a crest and trough form?Zero displacement, Destructive
- 11What is a Coherent source?Waves have the same frequency and wavelength annd have a constant phase difference
- 12What is interference?When two waves superimpose
- 13What are nodes?Points of zero displacement
- 14When do nodes occur?When two waves are 180 degrees out of phase
- 15What are antinodes?Points of maximum displacement
- 16When do antinodes occur?When waves are in phase
- 17When waves have different amplitudes, what will it causeTotal cancellation cannot occur
- 18What are stationary waves?Are produced when two progressive waves pass through each other
- 19What is the first stationary wave pattern called?First harmonic
- 20What is the distance between nodes?Half a wavelength
- 21Do stationary waves transfer energy?They don't transfer energy
- 22Why does refraction occur?It occurs because the speed of the light waves is different in each material
- 23What happens to the light ray if it goes into a material that is more refractive?Bends towards the normal
Visa versa - 24What does a greater refractive index cause?Slows down the light
- 25How does refraction effect frequency of a wave?It doesn't
- 26What happens if the angle of incidence is the same as the critical angle?The light will follow the boundary
- 27What happens if the angle of incidence is greater than the critical angle?Total internal reflection
- 28What is partial internal reflection?When the angle of incidence is less than or equal to the critical angle
- 29What is diffraction?The spreading out of waves as they pass through a gap
- 30What happens to the diffraction when the gap is bigger?The diffraction pattern is less spread out, narrower central maxima, and more intense central maxima
- 31What happens to the diffraction when the gap is Smaller?The diffraction pattern is more spread out, wider central maxima, and less intense central maxima
- 32What happens to the diffraction when the wavelength is increased?The diffraction pattern is more spread out,
wider central maxima, and less intense central maxima - 33Describe the diffraction patternA central fringe, and dimmer smaller fringes
- 34What is the size comparison of fringes?The central fringe is twice the size of smaller fringes
- 35What increases the angle between the fringes?Wavelength is increased
Closer spaced slits - 36What is laser light?A Coherent source
- 37What must two light sources be for interference to occur?Coherent and monochromatic light
- 38What is monochromatic light?Light of a single wavelength
- 39Single slit using white lightCentral white fringe
Fringes with a spectre of colours, red on the outside and blue on the inside - 40Difference of pattern created by single slit between white light and laserWhite light:
1) Has different colours
2) less intense
3) maxima wider/minima narrower
4)max and min closer together - 41What does absorption in an optical cable cause?Amplitude being reduced
- 42What does dispersion in an optical cable cause?Pulse broadening
- 43Two types of dispersion?Modal dispersion - The rays enter at different angles, so will take different paths
Material dispersion - Light used has different wavelengths, so travels at different speeds down the fibre - 44Why are optical repeaters used?To clear the signal as it is affected by absorption and dispersion
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- AS - Level (Waves) Physics Fichas sobre Waves, creado por sebi2899 el 15/03/2016.
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- sebi2899
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