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26 Cards in this Set
- Front
- Back
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Electric field strength
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Force per unit positive charge
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Magnetic flux density
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A measure of the strength of a magnetic field
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Tesla
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Unit of magnetic flux density
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Magnetic flux
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Magnetic flux density * area
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Weber
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Unit of magnetic flux
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Magnetic flux linkage
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Product of magnetic flux and number of turns on the coil
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Fararday's law
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Induced emf = rate of change of flux linkage
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Lenz's Law
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Induced current is in a direction so as to oppose the flux change producing it.
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Capacitance
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Charge stored per unit PD
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Farad
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Coulomb per volt
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Time constant
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The time taken for the charge in a capacitor to fall to 1/e of the initial value
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Proton number
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Total number of protons (atomic number)
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Nucleon number
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Total number of neutrons and protons (mass number)
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Isotope
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A variant of an element with the same number of protons but a different number of neutrons.
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Spontaneous decay
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Decay occurs without external influence
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Random decay
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Cannot predict when a nucleus will decay next
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Activity
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Average number of nuclei that decay per seconds (Unit Becquerels)
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Half-life
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Average time for the number of nuclei to decay to half the original value
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Decay Constant
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Probability that a nucleus will decay in unit time
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Binding energy
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Energy needed to separate a nucleus into separate nucleons
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Binding energy per nucleon
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Average energy required to remove a nucleon from the nucleus
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Intensity
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Power per unit cross sectional area
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Doppler effect
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Change in wavelength caused by the relative motion between the wave source and observer
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Critical density
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The density of the universe that will give rise to a flat universe
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Cosmological principle
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On a large scale, the universe is uniform
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Olber's Paradox
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For an infinite, uniform and static universe, the night sky should be bright because of the light received in all directions from stars.
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