Other pages in this set

Page 2

Preview of page 2

Here's a taster:

The Electromagnetic Spectrum
Electromagnetic radiation travels as waves. The waves carry energy.
Electromagnetic radiation can travel through a vacuum (space)
Wavelength and Amplitude of a Wave
wavelength
amplitude
Frequency of a Wave
How many waves pass by in 1 second.
Measured in Hz (Hertz)
e.g.
time = 0
time = 1 second later
3 waves have gone past in 1
second.…read more

Page 3

Preview of page 3

Here's a taster:

The Electromagnetic Spectrum
Type of Radiation Wavelength Frequency
Gamma radiation shortest Highest
X rays
Visible light
Infra red radiation
Microwaves
Radio waves Longest Lowest
Speed of Electromagnetic Waves
All electromagnetic waves travel at the same speed
wave speed (m/s) = frequency (Hz) x wavelength (m)
(if you need to use this it will be printed in the exam paper)
e.g. A radio signal has a frequency of 2000 000 Hz and a wavelength of 150m.…read more

Page 4

Preview of page 4

Here's a taster:

Electromagnetic waves can be reflected off a substance or transmitted through it or absorbed by it.
Reflected:-
Transmitted:-
Absorbed:-
When electromagnetic waves are absorbed by an object the object heats up. The waves might cause an
alternating current in the substance.…read more

Page 5

Preview of page 5

Here's a taster:

Can't get through thick
lead
Gamma Rays
Kill or damage
Can cause cancer
living cells.
Can also be used to kill
cancer cells.
Kill bacteria on food so it
stays fresh for longer
Sterilise surgical instruments
by killing microbes on them.…read more

Page 6

Preview of page 6

Here's a taster:

Can damage living cells
and cause cancer
Stopped by thick
metal.
X rays
Absorbed by bones but not soft
tissue.…read more

Page 7

Preview of page 7

Here's a taster:

Security markers
Coating inside fluorescent tubes (write in ink that can only be seen
when ultra violet radiation shines on
it.)
Some substances absorb ultra
violet radiation and give out
visible light
Ultra violet radiation
From sun and sun beds.…read more

Page 8

Preview of page 8

Here's a taster:

Eyes see different wavelengths as different
colours
Longest Lowest
red frequency
wavelength
orange
yellow
green
White light (from the Sun or a lamp)
is a mixture of all colours of light.
blue
indigo
violet Shortest Highest
wavelength frequency
Visible light
Given out by Sun, lamps etc.
Transmitted through optical fibres
for communications.…read more

Page 9

Preview of page 9

Here's a taster:

Can burn the
Night vision cameras "see" infra
skin
Hotter objects give red
out more infra red
radiation
Used in radiant heaters,
toasters, grills.…read more

Page 10

Preview of page 10

Here's a taster:

Damage or
Microwave ovens kill body cells
Absorbed by water
molecules, heating the
water up
Microwaves
Communications
Mobile phone and satellite TV Signals to and from
Signals in mobile phone networks satellites
microwaves pass
through the
atmosphere
J Wilkinson Page 10…read more

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »