Topic: Waves
Aim: Describe the electromagnetic spectrum.
Do Now: Take out your electromagnetic waves
reading notes.
Take out your waves reading notes – Complete
#’s 1 - 7
HW: Magnetism Reading notes and Gravity ISN
due Friday 5/29
Get your chemistry test signed.
CL Waves due Thursday 5/28
Wavelength Crest
Trough
1. Identify then type of wave represented. Transverse
2. Identify a crest by placing a large dot where it is located and
writing “CREST” near the dot.
3. Identify a trough by placing a large dot where it is located
and writing “TROUGH” near the dot.
4. Identify and label a wavelength by drawing a line to
represent your wavelength. Write “WAVELENGTH” on top
or below the line.
5. How many wavelengths are visible in this diagram?
2
A
B
1. Identify then type of wave represented.
Longitudinal wave
2. Identify the parts of this wave labeled A and B.
A – Compression
B- Rarefaction
Identify the wave behavior in the diagrams
below. Support your answer.
B
A
Refraction is when the wave bends.
Reflection is when the wave bounces off the
surface.
Any substance through which a
wave can travel is called a
1.solid
2.vacuum
3.medium
4.liquid
Waves transfer
1.energy
2.matter
3.particles
4.heat
Which of the following is the best
example of a wave?
1.A stone rolling downhill
2.A vehicle moving on a bumpy
road
3.A string vibrating on a guitar
4.A grasshopper jumping up and
down
• Transverse waves
1. What kind of
waves are
• Bc electric field and
electromagnetic magnetic field are
waves? Support
positioned
at
RIGHT
your answer.
ANGLES to each other
and to the motion of the
wave
2. Explain why
• They do not carry energy
electromagnetic by causing matter to
waves can travel
vibrate
through a
vacuum.
Speed of• In a vacuum =
an EW
– 300 million m/s
– Speed of light
3. Describe what
happens to the
frequency as you
move from left to
right on the
electromagnetic
spectrum.
• Frequency increases.
4. Describe what
•
happens to the
energy as you move
from left to right
on the
electromagnetic
spectrum.
Energy increases.
5. Describe what
happens to the
wavelength as you
move from left to
right on the
electromagnetic
spectrum.
• Wavelength decreases.
6. Identify the
electromagnetic
waves with the
lowest frequency
and energy.
• Radio waves
7. Identify the
electromagnetic
waves with the
greatest
frequency and
energy.
• Gamma rays
8. Identify the
electromagnetic
waves with the
longest
wavelength.
• Radio waves
RADIO WAVES - Used for radio,
TV, cell phones, MRI’s
9. Identify the
electromagnetic
waves with the
shortest
wavelength.
• Gamma rays
10. Describe what
happens to the
energy of a wave
as its wavelength
gets smaller.
• Energy increases as
wavelength gets smaller.
11. Which type of
wave can cause
our skin to burn
during the
summer?
• UV waves
•Kills bacteria
• Make some materials fluorescent
– Fluorescent powder  show
fingerprints
12. Which wave
are used for
radar images?
• Microwaves
13. Which types
of waves are
visible?
• Visible light waves
Light is a type of electromagnetic
wave. In matter, it’s speed depends on
the medium it travels though.
14. Which color
light has the
longest
wavelength?
• RED
15. Which type of
wave can be felt
as heat?
• Infrared waves
Ex: Remote controls emit infrared
waves to control TV
• Computers - to read CD-ROMs.
• Thermal imaging
16. Why do we • Doctors can look at
use X-Rays?
our bones
• Airport screening devices
17. Describe one
disadvantage
of using gamma
rays to kill
cancer cells.
• They kill all living
cells.
• Produced during nuclear
reactions (in nucleus of atoms)
Used in radiation therapy to
kill cancer cells
Let’s summarize…
1.Identify the type of waves elecromagnetic
waves are.
2.How are electromagnetic waves arranged in the
electromagnetic spectrum?
3.Describe each type of EW in the
Electromagnetic spectrum.
http://www.youtube.com/watch?v=7hwzG0YI9ms
http://www.youtube.com/watch?v=cfXzwh3KadE
http://www.pbslearningmedia.org/resource/npe11.sci.phys.energy.emxray/tour-of-the-electromagnetic-spectrum-xrays/
http://www.youtube.com/watch?v=PPlrtgilgK8
In an electromagnetic wave, an electric
field exists perpendicular to the
direction of travel of the wave. These
characteristics indicate that an
electromagnetic wave is which of the
following wave types?
a. gravitational
b. longitudinal
b. mechanical
d. transverse
When comparing the types of
electromagnetic waves, which has the
greatest energy?
a. Ultraviolet
b. X-rays
c. Gamma rays
d. Visible
Which of the following is a similarity
between x-ray waves and sound
waves?
a. Both transfer energy.
b. Both require a medium.
c. Both have the same speed.
d. Both have the same frequency.
The figure below shows regions of the
electromagnetic spectrum.
Radio Microwaves Infrared Visible UV Gamma
Which of the following waves has the highest
frequency?
a. Visible light
c. microwaves
b. UV rays
d. infrared radiation
What property of electromagnetic waves
makes it possible to use these waves to
transmit information between a space
shuttle and NASA mission control centers
on the ground?
a.EW’s are transverse waves.
b.EW’s have a very low velocity.
c.EW’s are all visible to the human eye.
d.EW’s can travel through a vacuum.
Which of the following statements applies to
longitudinal waves?
1.The motion of the medium is random.
2.The motion of the medium is in a circular
pattern.
3.The motion of the medium is parallel to the
motion of the wave.
4.The motion of the medium is perpendicular
to the motion of the wave.
Sound reaches our ears because
sound makes particles
1.heat up.
2.slow down.
3.cool down.
4.vibrate.
The distance between the Earth and the moon
was determined by measuring the time it took for
light waves from the Earth to travel to the moon
and back. Why was it not possible to use sound
waves for this experiment?
1.Sound waves must move through a substance.
2.Sound waves change frequency on the return
to earth.
3.Sound waves move too slowly for this
technique to be accurate.
4.Sound waves move more slowly in the Earth’s
atmosphere than in space.
A large spring is stretched horizontally between 2
people. One person wiggles the spring up and
down at one end. The up-and-down vibration then
moves along the spring on to the other person.
Which of the following type of wave is created in
the spring?
1.pressure wave
2.longitudinal wave
3.transverse wave
4.nonmechanical wave
Identify the kind of wave represented in
each diagram. Support your answer.
longitudinal wave
transverse wave