2.5 Wave Properties Flashcards

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1
Q

Reflection

A

Is the reflection of a wave when it hits a flat barrier

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2
Q

Refraction

A

IS the change in direction of a wave at the boundary between two materials caused by a change in speed

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3
Q

Diffraction

A

Is the spreading of a wave when it meets an obstacle into regions where it would not be seen if it moved in only straight lines

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4
Q

Wide gap produces … diffraction effect

A

Small

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5
Q

Narrow gap produces … diffraction effect

A

Large

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6
Q

Principle of superposition

A

If the waves from two sources occupy the same region then the total displacement at a point is the vector sum of the displacements of the individual waves at that point

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7
Q

What are the two different types of interference

A

Constructive and destructive

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8
Q

When two waves arrive at the same point in phase they produce …

A

Constructive interference, And and amplitude of 2A

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9
Q

When two waves arrive at the same point out of phase they produce …

A

Destructive interference, which will result in a smaller amplitude

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10
Q

Coherent

A

Means that there is a constant phase difference

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11
Q

Path difference

A

Is a measure of the distance between two waves arriving at a point in terms of wavelength

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12
Q

What does Youngs double slit experiment produce?

A

Bright fringes = constructive interference
Dark fringes = destructive interference

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13
Q

λ = aΔy / D

A

λ = wavelength
a = distance between the centre of slits
Δy = fringe separation
D = distance from double slit to screen

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14
Q

What is the historical importance of Young’s double slit experiment?

A

Newton said that light was particle like in nature, but this experiment proved light had wave like properties

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15
Q

dsinθ = nλ

A

d = slit width
sinθ = angle of light
n = order number
λ = wavelength

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16
Q

A diffraction grating produces much sharper beams due to …

A

the larger number of slits

17
Q

A diffraction grating produces orders (beams) much further apart than young’s double slit due to …

A

The very small slit width

18
Q

Stationary waves

A

Are produced from the superposition of two progressive waves of equal amplitude and frequency, travelling in opposite directions