Waves - Diffraction - smart phone physics

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  • Created by: Mal
  • Created on: 19-03-14 12:01
Preview of Waves - Diffraction - smart phone physics

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Introduction
VIDEO
...introduction to the
Interference Patterns
produced by the
Diffraction of light
through small gaps.…read more

Page 3

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Introduction
In DIFFRACTION, only
the direction of wave
travel (ray) is changed
when the wave passes
through an opening.…read more

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Introduction
DIFFRACTION can only
be produced by waves.
So ELECTRON
DIFFRACTION is key
evidence that particles
are waves.…read more

Page 5

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Uses
Diffraction is a key
method for creating
INTERFERENCE
PATTERNS; diffracted,
coherent waves
superpose to give
regions of constructive
and destructive
interference (due to the
path difference between
the waves)…read more

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Coherence
"Coherent" sources
produce waves which
have:
1. The same wavelength
2. The same phase
relationship.
3.…read more

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Path and
Phase
Try not to confuse Path
Difference and Phase
Difference.
Path difference is a
distance expressed in
metres (or some
multiple of , e.g.…read more

Page 8

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Conditions
To get constructive
interference at a point,
the path difference
between any waves
arriving at that point
must equal n.…read more

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Maxima
Since the amplitude of
the resultant wave at a
point of constructive
interference is a
maximum, these
positions are also
known as Maxima.…read more

Page 10

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Conditions
To get destructive
interference, the path
difference between any
waves arriving at these
point must equal
(n+½).…read more

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