Dr. Makin Advanced 7 th Science Clarence Middle School
Slide 3
Are created when a source of energy causes a vibration to move
through a medium.
Slide 4
Is a wave that causes the medium to vibrate perpendicular to
the direction of the wave.
Slide 5
Is a wave in which the vibration of the medium (movement of the
particles) is parallel to the wave direction.
Slide 6
Slide 7
Are waves that travel along a surface separating a media. It
contains both transverse and longitudinal waves.
Slide 8
Periodic frequency is any motion that repeats at regular
intervals and any periodic motion has frequency, which is the # of
complete cycles in a given time period. Frequency = cycles /s or
hertz (Hz) or 1/s
Slide 9
Wavelength is the distance between a point on one wave to the
same point on the next wave in a cycle recorded in meters(m).
Slide 10
Wave speed = Wavelength * Frequency Or v = * f v = speed(m/s)
=wavelength(m) f = frequency(Hz or 1/s)
Slide 11
Amplitude is the maximum displacement of a wave from its rest
position. It can be measured from the trough or the crest to rest.
rest
Slide 12
Slide 13
RReflection is when a wave bounces off a surface it cannot pass
through. It does not change the speed or frequency of a wave but
the wave can be flipped upside down.
Slide 14
RRefraction is the bending of a wave as it enters a medium at
an angle. It occurs because one side of the wave is moving more
slowly than the other.
Slide 15
DDiffraction is the bending of a wave as it moves around an
obstacle. The larger the wavelength in comparison to the obstacle
the more it diffracts.
Slide 16
IInterference occurs when two or more waves overlap and combine
together. They can be constructive or destructive.
Slide 17
AAre transverse waves consisting of electric fields and
changing magnetic fields. They are produced when an electric charge
vibrates or accelerates. They can travel through a vacuum or a
medium.
Slide 18
AAlbert Michelson measured the speed of light more accurately
then his predecessors. He used a series of mirrors to do it.
Slide 19
A. 3.00 X10 8 m/s B. Or 6.7x10 8 mph WWhen calculating wave
frequency of EMS we use A for speed
Slide 20
SSometimes light behaves as both. TThomas Young showed that
light behaves as a wave.
Slide 21
HHeinrich Hertz found that shining a light on metal emitted
electrons. It was later determined by Einstein that light is
composed of Photons and that the higher the energy of the wave the
greater its ability to emit electrons from a medium like
metal.
Slide 22
DDecreases as photons travel farther from their source.