Physics Revision Flashcards
How do you find out random uncertainty?
(Max reading - minimum reading) divided by number of readings
What is an electric field?
A region of space in which a charged particle can experience a force without being in contact with another object
What is 1 volt?
1 joule of energy supplied to each coulomb of charge
What is the electro motive force?
The energy supplied to each coulomb of charge by a source of electrical energy. (Max volts from a cell when no current)
What is lost volts?
The voltage across the internal resistance of a cell
What is a.c?
Alternating current, repeatedly changes directly. Voltage changes in magnitude
What is d.c
Direct current, charge flows in one direction from negative to positive. Voltage is a constant magnitude
What is capacitance?
The measure of charge stored per volt
What is the photoelectric effect?
When electrons are ejected from a surface of metal due to radiation being above a certain frequency
What is threshold frequency?
The minimum frequency required to eject electrons from a surface of metal
What is work function?
The minimum energy required for a metal to remove excess electrons from its surface
What is constructive interference?
When the waves from two sources meet and a point perfectly in phase
What is destructive interference?
When the waves from two sources meet at a point perfectly out of phase
What is the absolute refractive index?
The ratio of the speed of light in a vacuum to the speed of light in a material
What is the critical angle?
The angle of incidence that results in an angle of refraction of 90 degrees to the normal
