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
