Waves - The EM Spectrum - smartphone physics

Download this file and copy it across to your phone.

You'll need to install a free PDF document reader (like the Adobe Acrobat Reader) onto your phone as well.

Open the pdf file and revise wherever, whenever, whatever :)

To find more revision resources in this series, just search getrevising using the search phrase "smartphone physics" - include the quotation marks.

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

Pages in this set

Page 1

Preview of page 1
E.M. Spectrum
Classification of the spectrum
Description of EM waves

Page 2

Preview of page 2
Introduction
An electromagnetic wave consists
of an Electric Field which oscillates
perpendicular to an oscillating
magnetic field. Can transfer 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 3

Preview of page 3
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 4

Preview of page 4
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 5

Preview of page 5
Ultra-violet
VIDEO
...on the Ultraviolet part of the E.M.
Spectrum

Page 6

Preview of page 6
Why E.M.?
What do we mean by
"Electromagnetic Waves"?
Electromagnetic waves are made of
oscillating Electric and Magnetic
Fields.

Page 7

Preview of page 7
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 8

Preview of page 8
Fields?
And if you have CHARGE, you can
experience a force if you are located
in a constant electric field and/or
moving through a constant magnetic
field.

Page 9

Preview of page 9
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 10

Preview of page 10
Electric Field Strength
Magnetic Field Strength

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

E.M. Wave

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »

Waves - The EM Spectrum - smartphone physics

Download this file and copy it across to your phone.

You'll need to install a free PDF document reader (like the Adobe Acrobat Reader) onto your phone as well.

Open the pdf file and revise wherever, whenever, whatever :)

To find more revision resources in this series, just search getrevising using the search phrase "smartphone physics" - include the quotation marks.

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

Pages in this set

Page 1

Preview of page 1
E.M. Spectrum
Classification of the spectrum
Description of EM waves

Page 2

Preview of page 2
Introduction
An electromagnetic wave consists
of an Electric Field which oscillates
perpendicular to an oscillating
magnetic field. Can transfer 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 3

Preview of page 3
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 4

Preview of page 4
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 5

Preview of page 5
Ultra-violet
VIDEO
...on the Ultraviolet part of the E.M.
Spectrum

Page 6

Preview of page 6
Why E.M.?
What do we mean by
"Electromagnetic Waves"?
Electromagnetic waves are made of
oscillating Electric and Magnetic
Fields.

Page 7

Preview of page 7
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 8

Preview of page 8
Fields?
And if you have CHARGE, you can
experience a force if you are located
in a constant electric field and/or
moving through a constant magnetic
field.

Page 9

Preview of page 9
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 10

Preview of page 10
Electric Field Strength
Magnetic Field Strength

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

E.M. Wave

Comments

No comments have yet been made