# Physics keywords

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Rarefraction (waves)
A moving region in which the medium is less dense than the surrounding medium.
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Angle of incidence
Angle between the direction of travel of an incident wave and the normal.
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Angle of reflection
Angle between the direction of travel of a reflected wave and the normal.
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Coherence
Two waves that are coherent have a constant phase relationship.
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deBroglie equation
wavelength=planck's constant / moment
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Destructive interference
Superposition of two waves out of phase.
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Displacement (waves)
The distance from the equilibrium position in a particular direction.
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Frequency (waves)
Number of wavelengths passing a given point per unit time.
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Intensity (waves)
The radiant power passing through a surface per unit area.
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Longitudinal wave
Oscillations of the medium particles are parallel to the direction of the wave travel.
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Period (waves)
Time taken for one complete wavelength to pass one given point.
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Standing wave
A wave that remains in a constant position with no energy transfer.
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Wavefront
A line of points in phase with each other in a wave, perpendicular to the direction of energy transfer.
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Wave-particle duality
A theory that states that matter has both particle and wave properties.
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Amplitude (waves)
The maximum displacement from the equilibrium position.
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Compression (waves)
A moving region in which the medium is denser than the surrounding medium.
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Equilibrium position (waves)
The resting position for particles in the medium.
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Maximum and minimum (waves)
The point of greatest, or lowest, amplitude in an interference pattern.
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Refractive index
Refractive index=speed of light through a vacuum / speed of light through the material
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Law of reflection
Angle of incidence is equal to the angle of reflection.
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Infrared waves
An EM wave, with a waavelength between 10*-3 to 7x10*-7
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Acceleration
The rate of change of velocity.
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Acceleration of free fall
The rate of change of velocity of an object falling in a gravitational field.
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Air resistance
The drag experienced by objects moving through air.
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Ammeter
A device used to measure electric current.
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Ampere
The base SI unit of electric current.
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Anion
A negatively charged ion, one that's attracted to an anode.
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Anode
A positively charged electrode.
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Antiphase
Particles oscillating completely out of step with each other are in antiphase.
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Archimedes' principle
The upthrust on an object in a fluid is equal to the weight of fluid it displaces.
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Average speed
The rate of change in distance calculated over a complete journey.
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Base unit
One of seven units that form the building blocks of the SI measurement system.
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Battery
A collection of cells.
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Braking distance
Distance travelled by a vehicle from the time the brakes are applied until the vehicle stops.
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Breaking strength
The stress value at the point of fracture.
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Brittle
Property of a material that does not show plastic deformation and deforms very little under high stress.
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Capacitor
A component that stores charge.
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Cathode
A negatively charged electrode.
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Cation
A positively charged ion, one which is attracted to a cathode.
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Cell
A device that transfers chemical energy into electrical energy.
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Centre of gravity
An imaginary point at which the entire weight of an object appears to act.
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Centre of mass
A point through which any externally applied force produces straight-line motion but no rotation.
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Charge carrier
A particle with charge that moves through a material to form an electric current.
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Closed system
An isolated system that has no interaction with its surroundings.
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Compression
The decrease in length of an object when a compressive force is exerted on it.
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Comprehensive deformation
A change in the shape of an object due to compressive forces.
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Conservation of charge
A conservation law which states that electric charge can neither be created or destroyed.
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## Other cards in this set

### Card 2

#### Front

Angle between the direction of travel of an incident wave and the normal.

#### Back

Angle of incidence

### Card 3

#### Front

Angle between the direction of travel of a reflected wave and the normal.

### Card 4

#### Front

Two waves that are coherent have a constant phase relationship.

### Card 5

#### Front

wavelength=planck's constant / moment