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© 2004 Plano ISD, Plano, TX
During every waking and sleeping moment of our lives, we are
bombarded with
During every waking and sleeping moment of our lives, we are
bombarded with
of energy.of energy.
© 2004 Plano ISD, Plano, TX
Most energy waves
collide with us or pass
right through us without any
notice on our part.
Most energy waves
collide with us or pass
right through us without any
notice on our part.
Waves carry energy, but not matter; however,
Waves carry energy, but not matter; however, matter can
be used to transfer energy.
matter can be used to
transfer energy.
© 2004 Plano ISD, Plano, TX
The matter used to transport the
wave is a medium.
The matter used to transport the
wave is a medium.
What is the
medium?
What is the
medium?
Waves that use matter to transfer
energy are mechanical wavesmechanical waves.
Waves that use matter to transfer
energy are mechanical wavesmechanical waves.
© 2004 Plano ISD, Plano, TX
In the 15th century, Leonardo da Vinci
observed that while waves move, the medium (water)
does not, “like the waves made in a
field of grain by the wind, where we see the waves running
across the field while the grain
remains in place.”
In the 15th century, Leonardo da Vinci
observed that while waves move, the medium (water)
does not, “like the waves made in a
field of grain by the wind, where we see the waves running
across the field while the grain
remains in place.”
© 2004 Plano ISD, Plano, TX
Water,sound, and earthquake waves are
examples of mechanical waves.
Water,sound, and earthquake waves are
examples of mechanical waves.
© 2004 Plano ISD, Plano, TX
Mechanical waves can be classified according to the
direction of the motion of matter in relation to the direction of
wave motion.
Mechanical waves can be classified according to the
direction of the motion of matter in relation to the direction of
wave motion.
© 2004 Plano ISD, Plano, TX
Mechanical waves in which matter moves up and down or back and forth at right angles compared to the direction of
wave movement are transverse waves.
Mechanical waves in which matter moves up and down or back and forth at right angles compared to the direction of
wave movement are transverse waves.
Click here to see transverse
waves in action!
© 2004 Plano ISD, Plano, TX
Mechanical waves in which medium matter moves forward
and backward in the same direction the wave travels are longitudinal or compressional
waves.
Mechanical waves in which medium matter moves forward
and backward in the same direction the wave travels are longitudinal or compressional
waves.Click here to see compressional
waves in action!
© 2004 Plano ISD, Plano, TX
Amplitude:Distance betweencrest and troughWavelength: Distance between 2 crests OR 2 troughsFrequency: waves per second (measured in Hertz/Hz)Speed: distance per second
Properties of Waves
© 2004 Plano ISD, Plano, TX
Waves that do not require matter to
transfer energy are electromagnetic electromagnetic
waveswaves.
Waves that do not require matter to
transfer energy are electromagnetic electromagnetic
waveswaves.
Electromagnetic waves can travel
through a medium, but they can also travel in space or
through a vacuum.
Electromagnetic waves can travel
through a medium, but they can also travel in space or
through a vacuum.
© 2004 Plano ISD, Plano, TX
Radio waves, X-rays, microwaves, and visible light
waves are examples of
electromagnetic waves.
Radio waves, X-rays, microwaves, and visible light
waves are examples of
electromagnetic waves. They can all travel
through empty space and they all travel at the same speed. This speed
is sometimes called The
Speed of Light.
They can all travel through empty
space and they all travel at the same speed. This speed
is sometimes called The
Speed of Light.
© 2004 Plano ISD, Plano, TX
Electromagnetic waves are
produced by charged particles
that move. Energy from EM waves is
called EM RADIATION.
Electromagnetic waves are
produced by charged particles
that move. Energy from EM waves is
called EM RADIATION.
Even though EM waves have the
same speed, they have different
wavelengths and frequencies. (look
at the EM spectrum)
Even though EM waves have the
same speed, they have different
wavelengths and frequencies. (look
at the EM spectrum)
© 2004 Plano ISD, Plano, TX
Review the information on waves by filling in the
concept map.
Review the information on waves by filling in the
concept map.
Waves
Waves
do not move or carryenergy
include examples such as
transfer energy through
matter called a
________
includes
transfer or carry
mechanical waves
matter
can be classified into two categories
electromagnetic waves
medium
solids, liquid
s, gasse
s
longitudinal or
compression waves
transverse waves
matter forward
and backward
in the same
direction of wave
movement
matter up and down or back
and forth at right angles
compared to the
direction of wave
movement
move move
to transfer
do not require
include examples such as
matter
energy
are further classified into
are a special type of
© 2004 Plano ISD, Plano, TX
Bibliography
Bibliography
Macaulay, David. (1988). How things work. Boston: Houghton Mifflin Company. pp. 186 Macaulay, David. (1988). How things work. Boston: Houghton Mifflin Company. pp. 186
Resnick, Halliday, Krane. (1992). Physics. 4th Edition, Volume 1. New York: John Wiley & Sons, Inc. pp. 417-418.
Resnick, Halliday, Krane. (1992). Physics. 4th Edition, Volume 1. New York: John Wiley & Sons, Inc. pp. 417-418.
“What are waves?” (2002). Texas Science. New York: Glenco McGraw-Hill,pp. 186-187. “What are waves?” (2002). Texas Science. New York: Glenco McGraw-Hill,pp. 186-187.