Flashcards
#RunTheBath Physics - Waves - Easy
Flashcards do conjunto (32)
- 1MechanicalTravel Through a medium, Examples:
Sound, Water, Seismic - 2ElectromagneticDo not need a medium, Examples:
Radio, Micro, Infra red, Visible, Ultra violet, Xray, Gamma - 3TransverseThe direction of the wave is perpendicular to the direction of the oscillations
- 4LongitudinalThe direction of the wave is parallel to the direction of oscillations (always mechanical)
- 5AmplitudeThe maximum displacement of a point on a wave from the mean position
- 6WavelengthThe distance between two adjacent points at the same point in the cycle/with the same phase
- 7FrequencyNumber of times the wave passes a certain point per second
- 8Wave speedThe distance covered per unit of time
- 9Time periodThe time taken to complete one full cycle
- 10VEE EQUALS EF LAMDAv = fλ
- 11EYE EQUALS PEE OVER AYEI = P/A
- 12Intensity (Wm ^-2)A combination of a waves rate and density of energy transfer
- 13PolarisationPlane polarisation is when the oscillations are only happening in one plane, perpendicular to the direction of the wave
- 14Wave FrontsThe leading edge (crest) of a wave. The perpendicular distance between two wave crests is one wavelength
- 15CoherenceWhen two waves have a constant phase difference
- 16Path DifferenceThe difference in distance travelled by two coherent waves from a certain point
- 17SuperpositionThe medium takes on the affect of 2 waves total displacement
- 18Interferencethe medium takes on the shape of the vector sum of 2 waves
- 19PhaseDescribes a point in a position through one wave cycle
- 20Stationary wave patternWhen two continuous waves travelling in opposite directions, towards each other, superpose continuously (waves need to be of the same freq, with similar amplitudes and have constant phase relationship)
- 21NodeNO DISPLACEEEEEEEMENT
- 22ANTINODETHE OPPSITE
- 23Speed of waves on a stringv = √(?/μ)
- 24RefractionOccurs when waves pass through different medium. The different refractive index of the medium cause the wave to change speed and therefore change direction
- 25ANGLESIf the second medium has a higher refractive index then the angle of refraction will be smaller than the angle of incidence, visa versa
- 26Refractive indexn = c/v
- 27What is the critical angle?The angle of incidence at which no more light is transmitted
- 28What is multipath dispersion?When the light can take multiple routes within the optical fibre. This can be stopped by making the core narrower or making the refractive index get higher towards the middle
- 29what is cross-talk?cross talk can occur when two optical fibres touch each other meaning the light can refract from one fibre to the next
- 30What is snell's Law
- 31What is the critical angle equation?
- 32Conditions for total internal reflectionThe refractive index of the glass core must be higher than the refractive index of the plastic cladding for TIR to occur