P&W: Interferenace and diffraction Flashcards

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1
Q

Interference

A

Provides evidence for the wave nature of light

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2
Q

Coherence (Coherent waves)

A

Coherent waves are waves which have a constant phase relationship.

When two or more waves have the same frequency, speed and wavelength.

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3
Q

Completely in Phase Waves

A

Two waves are completly in phase when the crest of one matches up with the crest of another.

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4
Q

Completly out of phase waves

A

Two waves are completly out of phases when the crest meets up with trough of the other wave.

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5
Q

Constructive Interferance

A

When two waves of equal amplitude meet in phase, they combine to form a wave of twice the amplitude.

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6
Q

Destructive Interference

A

When two waves of equal amplitude meet out of phase, they combine to form a wave of zero amplitude.

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7
Q

Maximum/Maxima

A

A point/points of constructive interferance

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8
Q

Minimum/Minima

A

A point/pouints of destructive interference.

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9
Q

Spectra produced using diffraction grating

A

Central maximum alsways same colour as source
More than one spectra
Red deviated most, violet least.
Spectra is less intense

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10
Q

Spectra produced usig a prism.

A

Only 1 spectrum produced.
Red deviated least, violet deviated the most.
The image is bright.

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11
Q

Rough values of different coloured lights

A

Red 700
Green 550
Blue 500
Violet 400

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12
Q

Factors to increase fringe spacing.

A

Increasng wavelegth
Decreasing the slit separation/ increassing the number of slits.
Increaing the distance between the slits and the screen.

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