Module 4 definitions

New spec starting 2015

Electrons, Waves and Photons

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Ammeter
A device used to measure electrical current and must be placed in series (ideally zero resistance)
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Ampere (A)
The base SI unit of electric current. The current flowing through two parallel wires in a vaccum 1m apart such that there is an attractive force of 2.0x10-7N per meter length of wire between them.
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Amplitude (waves)
The maximum displacement of a particle from its equilibrium position. (positive or negative)
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Anode
Positively charged electrode
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Antiphase
Particles oscillating completely out of step with each other (one reaches maximum positive displacement the same time the other reaches its maximum negative displacement)
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Charge carrier
A particle with charge that moves through a material to form an electric current.
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Coherence
Two waves sources, or waves, that are coherent have a constant phase difference
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Compression (waves)
A moving region in which the medium is denser or has a higher pressure than the medium surrounding it
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Conservation of Charge
electric charge cannot be created nor destroyed
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Constructive interference
Superposition of two waves in phase so that the resultant wave has a greater amplitude than the two original waves.
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Conventional Current
Current travels from positive to negative
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Coulomb
SI unit of electrical charge. 1 coulomb of charge passes a point per unit time when there is a current of 1A
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Critical Angle
The angle of incidence at the boundary between two media that will produce an angle of refraction of 90 degrees.
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Destructive interference
Superposition of two waves that are in antiphase so they cancel each other out and the resultant wave has an amplitude smaller than the two originals.
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Diffraction
The spreading out of waves when it passes through a gap very similar to the size of its wavelength or around an obstacle
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Diode
A component that only allows current to flow in one direction
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Displacement (waves)
The distance from the equilibrium position in a particular direction (positive or negative)
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Electric Current
The rate of flow of charge
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Electromagnetic Waves
Transverse waves that do not require a medium to propagate. They have oscillating magnetic and electric components.
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e.m.f
Electromotive force. The work done on the charge carriers per unit charge (energy transferred to electrical energy from other forms)
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Equilibrium Position (waves)
Resting position for particles in the medium
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Frequency (waves)
The number of wavelengths passing a point per unit time
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Other cards in this set

Card 2

Front

The base SI unit of electric current. The current flowing through two parallel wires in a vaccum 1m apart such that there is an attractive force of 2.0x10-7N per meter length of wire between them.

Back

Ampere (A)

Card 3

Front

The maximum displacement of a particle from its equilibrium position. (positive or negative)

Back

Preview of the back of card 3

Card 4

Front

Positively charged electrode

Back

Preview of the back of card 4

Card 5

Front

Particles oscillating completely out of step with each other (one reaches maximum positive displacement the same time the other reaches its maximum negative displacement)

Back

Preview of the back of card 5
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