The SI unit for magnetic flux density. 1T = 1NA^-1m^-1
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Magnetic Flux
The product of magnetic flux density normal to a circuit and the cross-sectional area of the circuit. unit is Weber's
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Magnetic Flux Linkage
The product of the magnetic flux and the number of terms
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Faraday's Law
The emf induced is equal to the rate of change of magnetic flux linkage or the rate of flux cutting
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Lenz's Law
The induced current or EMF is in a direction so as to produce effects which oppose the change producing it
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Capacitance
The ratio of change stored by a capacitor to the PD across it
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Farad
Unit of capacitance. 1F = 1CV^-1
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Time Constant of a circuit
The time taken for the current, charge stored or PD to fall to 1/e (about 37%) when a capacitor discharges through a resistor. It is also equal to the product of capacitance and resistance
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Coulomb's Law
Any two point charges exert an electrical force on each other that is proportional to the product of their charges and inversely proportional to the square of the distance between them
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Newton's Law of Gravitation
Any two point masses attract each other with a force that is proportional to the sum of their masses and inversely proportional the square of their seperation
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Nucleon number
The number of protons and neutrons in the nucleus of an atom
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Isotopes
Nuclei of the same element with a different number of of neutrons but the same number of protons
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Activity
The rate of decay or disintegration of nuclei in a radioactive sample
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Decay Constant
The constant for an isotope that appears in the equation A = lambda*N. It is equal to the probability of an isotope decaying per unit time interval
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Half-Life
The mean time taken for half the number of active nuclei in a radioactive sample to decay
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Binding Energy
The minimum external energy required to seperate all the neutrons and protons of a nucleus
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Intensity
Power per unit cross-sectional area
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Olber's Paradox
For an infinite, uniform and static universe, the night sky should be bright because of light received in all direction from stars
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Hubble's Constant
The ratio of the speed of a receding galaxy to its distance from the observer. =v/x
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Cosmological Principle
A principle that states that the universe has the same large-scale structure when observed from any point in the universe
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Critical Density
The density of the university that will give rise to a flat universe.
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Black Hole
The remnant of a massive star formed as a result of matter collapsing to a singular point. The density of a black hole is so intense that even light cannot escape from it.
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Braking radiation
X-rays produced when electrons are decelerated
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Chandrasekhar limit
The maximum mass of a white dwarf - about 1.4 solar masses
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Closed universe
A model of the universe in which gravitational force is strong enough to halt its expansion and reverse the process towards a Big Crunch
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Dark matter
Matter that emits or reflects little EM radiation making it very difficult to detect
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Electron Degeneracy Pressure
Pressure created by closely packed electrons in a white dwarf due to Pauli's exclusion principle
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Larmor Frequency
The frequency of precession of nuclei in an external magnetic field
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Light year
The distance travelled by light in one year. =9.5x10^15 m
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Metastable
Describes a nucleus that is unstable but relatively long-lived state
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Open Universe
A model of the universe in which gravitational force cannot halt the expansion of matter.
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Redshift
The shifting of the entire spectrum of a receding source to longer wavelengths
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Other cards in this set
Card 2
Front
The strength of the magnetic field
Back
Magnetic Flux Density
Card 3
Front
The SI unit for magnetic flux density. 1T = 1NA^-1m^-1
Back
Card 4
Front
The product of magnetic flux density normal to a circuit and the cross-sectional area of the circuit. unit is Weber's
Back
Card 5
Front
The product of the magnetic flux and the number of terms
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