Download light waves

BELL WORK
Answer the following questions on a piece of paper. You will correct
these and turn in your answers.
1. Draw a picture of a wave with LOW frequency and LOW
amplitude.
2. Draw a picture of a wave with HIGH frequency and LOW
amplitude
3. What changes the speed of a sound wave? (think of the medium it
passes through)
4. Describe convection. Draw a picture to show it.
5. Describe conduction. Draw a picture to show it.
LIGHT WAVES
Light is transferred by radiation
Visible light has a large wave of
wavelengths
The color of light depends on its
wavelength
No medium is needed for
ELECTROMAGNETIC waves.
Light, radio, x-rays, and gamma rays
are some examples of e/m waves.
All e/m waves travel through free
space at a speed of approximately
3.00 x 108 m/s or 186,000 miles/sec.
This speed is known as the speed of light.
TYPES OF LIGHT - TRANSPARENT
Transparent Light –The
physical property of
allowing light to pass
through the material
without being
scattered. You can see
directly through
transparent light.
Examples – jelly fish, water, glass
TYPES OF LIGHT - TRANSLUCENT
Translucent light allows light to
pass through, but it is diffused so
persons or objects on the
opposite sigh are not clearly
visible.
Example: Frosted glass, sheer
material (like a shawl)
OPAQUE
You can NOT see through an
opaque substance. It will not
reflect any light on the other
side.
EXAMPLES: heavy lead mats
used for x-rays, solid objects,
such as wood or lead
BELL WORK – WEDNESDAY 11/4
Answer the following questions
carefully.
1. Draw a picture of a wave
with high amplitude and high
frequency.
2. What does Hz measure?
3. What is the speed of light in
meters?
4. Give an example of a
translucent object.
5. Is this object transparent,
translucent, or opaque?
TRANSVERSE
The displacement of the particles
of the medium is perpendicular to
the direction of wave propagation.
LONGITUDINAL
The displacement of the particles
of the medium is parallel to the
direction of wave propagation.
Reflection
the turning back of a wave when
it reaches the boundary of the
medium through which it is traveling
Law of Reflection
the angle of incidence is equal
to the angle of reflection
Refraction
the bending of a wave as it
passes obliquely from one
medium into another of
different propagation speed
For refraction to occur, the wave
must change speed and must enter
the new medium at an oblique angle.
Diffraction
the spreading of a wave
around a barrier or
through an opening
Interference
the result of the superposition
of two or more waves
Superposition Principle
the displacement of the medium when
two or more waves pass through
it at the same time
Types of Interference
Constructive
results in a larger amplitude
Destructive
results in a smaller amplitude