G485

Question	Answer
Electric Field Strength	The force experienced per unit charge exerted on a positive charge placed at that point.
Coulomb's Law	Two point charges exert an electrical force on each other that is directly proportional to the product of their charges and inversely proportional to the square of their separation.
Flemming's left hand rule	Thumb = direction of motion, First finger = magnetic field, Second finger = direction of current.
Magnetic flux density	When a wire carrying a current of 1A is placed at right angles to a field and experiences a force of 1N per metre.
Magnetic flux linkage	Number of turns x magnetic flux
Faraday's law of electromagnetic induction	The magnitude of induced emf is equal to the rate of change of magnetic flux linkage
Lenz's law	The direction of induced emf opposes the change thats producing it.
Farad	A capacitor has a capacitance of 1F when it can store 1 coulomb of charge per unit volt.
Half life	The average time taken for half the active nuclei to decay
Activity	The rate at which the nuclei decay or disintegrate
Decay constant	The probability of decay of a nucleus per unit time.
Binding energy	The minimum energy needed to separate all its nucleons.
How are x-rays produced?	When fast moving electrons smash into a target metal and are rapidly decelerated.
Acoustic impedance	Density x speed of ultrasound in materal
Astronomical unit	The mean distance between the Earth and the Sun
Light year	The distance travelled by light in a vacuum in a period of 1 year.
Parsec	The distance that gives a parallax angle of 1 second of an arc
Olber's paradox	For an infinite, uniform and static universe, the night sky should be bright because of light received from stars in all directions
Hubble's law	The recessional speed of a galaxy is directly proportional to its distance from us
The cosmological principle	The universe is homogeneous, isotropic and has universal laws of physics.

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	Created by kangarew97 about 9 years ago