As Physics Edexcel


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  • Created on: 01-05-11 20:45
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Amplitude - The maximum distance from the crest to the equilibrium
Frequency ­ The number of oscillations per second
Period ­ Time taken for one complete oscillation
Speed ­ Distance travelled per unit time. Speed is the scalar quantity that is the magnitude of
the velocity vector.
Longitudinal waves- Vibrations are along the direction of travel e.g. sound
Transverse waves- Vibrations are at a right angle to the direction of travel
Standing waves- Positions of the peaks and troughs are not moving
Nodes- are where the amplitude of the vibration is zero
Antinodes- are points of maximum amplitude
Phase- Points that are a whole wavelength apart oscillate in phase
Anti phase- Points that are half a wavelength apart oscillate in anti phase
Path difference- the amount in which one wave lags behind another wave (measured in
degrees and radians)
Refractive index- of a material measures how much it slows down light (Snell's Law)
Refraction- Change of direction of a wave that occurs when its speed changes
Plane polarised - Only transverse waves show ­ a wave in which oscillations occur in one
plane are plane polarised in that direction
Diffraction in waves- Interaction between waves and solid obstacles= the way that waves
spread out as they come though a narrow gap or go round obstacles
Doppler effect- can be used to measure the speed of objects
Principle of superposition- where two or more waves meet the total displacement at any
point is the sum of the displacements that each individual wave would cause at that point
Electric current- rate of flow of charged particles I = (change in) Q / (change in) T
Current- Rate of flow of charge
Potential difference- is the energy per unit charge
Emf - Amount of energy supplied to each unit of charge
Resistance- collision of atoms and electrons = how difficult it is to get a current to flow
Resistivity- Resistance of a material
Internal resistance- A source of EMF has some resistance to electric current within it
Drift Velocity- average velocity of the electrons
Ohms Law- Provided that the temperature and other physical factors remain constant the
current through the wire is proportional to the pd
Coulomb- amount of charge that passes in 1 second when current is 1 ampere

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Photons- particle of light
Photoelectrons- Electrons that escape from the surface of a metal under the presence of
UV light that transfers energy to electrons
Work function- energy required to completely remove one electron from the metal
Threshold frequency- minimum frequency of light below which the emission of
photoelectrons cannot happen for a given surface
Electron volt- 1ev is the energy transferred when an electron travels through a pd of 1 volt
Radiation flux- amount of energy landing on a unit area in a unit…read more


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