Waves - The EM Spectrum - smartphone physics

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  • Created by: Mal
  • Created on: 19-03-14 12:06

Pages in this set

Page 1

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Introduction
An electromagnetic
wave transfers Energy
between charged
particles.
Electromagnetic waves
can move through
physical media (e.g.
glass) but do not rely
on it, since even a
vacuum (space) has
magnetic and electric
properties.

Page 2

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The E.M.
Spectrum
Part of Spectrum
Gamma Rays Less than 1pm
X Rays Less than 10nm
Ultra-violet 10 to 400nm
Visible light 400 to 700nm
Infra-red 700nm to 1mm
Microwaves 1mm to 20cm
Radio 20cm or longer

Page 3

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Ultra-violet
UVA (400-315nm)
UVB (315-280nm)
UVC (280-100nm)
A ­ causes tanning
B & C cause sunburn &
skin cancer
We need some UVB to
make vitamin D
Sunscreen contains
chemicals to filter out
UVA and UVB.
UVC is blocked by the
atmosphere.
Glass also blocks all UV.

Page 4

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Ultra-violet
VIDEO

...on the Ultraviolet part
of the E.M. Spectrum

Page 5

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Why E.M.?
What do we mean by
"Electromagnetic
Waves"?
They have nothing to
do with electromagnets.

Electromagnetic waves
are made of oscillating
Electric and Magnetic
Fields.

Page 6

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Fields ?
You live in a constant
gravitational field.
A Field is a region
where a particular type
of object experiences a
Force.
If you are in a constant
gravitational field and
you have MASS, you
can experience a
gravitational force (i.e.
weight).

Page 7

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Fields ?
And if you have
CHARGE, you can
experience a force if
you are in a constant
electric field and/or
moving through a
constant magnetic field.

Page 8

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E.M. Wave
An Electromagnetic
wave is where the
strengths (i.e
amplitudes) of an
Electric Field and a
Magnetic Field keep
changing.
We can plot the Electric
and Magnetic Field
strengths on a graph
like this:-

Page 9

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E.M. Wave

Electric Field
Strength




Magnetic Field
Strength


This transverse wave
moves along at c, the
speed of light
(3.00 x 108 ms-1)

Page 10

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E.M. Wave

Electric Field
Strength




Magnetic Field
Strength


In fact:
Electric Field Strength
=c
Magnetic Field Strength

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