forever mini mistakes Flashcards
Define resistance
The ratio of the p.d. across a component to the current through it
Define resistivity
A measure of the resistance of a material to the flow of electrical current, equal to the resistance of a piece of material with unit cross-sectional area and unit length
Define equilibrium
Sum of moments about any point is 0
Define EMF
Energy supplies by a cell per unit of charge
Density of pure water
1000 kgm-3
Define coherent wave sources
Constant phase difference and same frequency
Define superposition
The sum of the displacement of two or more waves at a point
Compare the appearance of the zero-order maxima compared with the other higher order maxima of white light
Zero-order is white and other orders are spectra from violet to red away from the centre
Suggest a possible problem viewing higher number maxima at larger angles from the zero-order position of white light
Higher orders may overlap each other
Define a standing wave
Produced by the superposition of two waves of the same frequency and amplitude travelling in opposite directions. There are nodes and antinodes
Define a progressive wave
Transfers energy but not matter
Define a node
A point in a standing wave where the wave has minimum amplitude
Define anode
Anode is the positive terminal in an electrical circuit
Area under a stress-strain graph
Work doe/ volume
(Energy released by material)
Describe the material property hard
Materials that resist scratching, cutting or abrasion
Describe in terms of material property, stiff
Materials that have high resistance to deformation under a load
Define gravitational field strength
The force per unit mass due to gravity
