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Light and Waves

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by

CJ Scott

on 5 August 2013

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Transcript of Light and Waves

Introduction to Light and Waves
Academic Vocabulary
Light
is the common term for electromagnetic (EM) radiation, which travels through
space
as
waves
. There are 7 types of EM radiation:
radio waves
,
microwaves
,
infrared

light
,
visible

light
,
ultraviolet

light
,
x-rays
, &
gamma

rays
.
Creating a Scientific Model
4)Express the new frequency of the boat (from question 2) in Hz and in s :
Part V
Vocabulary Practice
Electromagnetic SLAP!
Learning Goals:
-I know that EM waves carry energy through space and how that energy is related to the wavelength and frequency of a wave.

-I can make a scientific model of the EM spectrum and understand how we use EM radiation in our everyday lives.
Together, they make up the electromagnetic
spectrum
. EM radiation is classified by
wavelength
or frequency.
Longest wavelength?
Wavelength is the
distance
between high points of 2
consecutive
waves, while frequency is a measure of the
number
of waves passing through a point every
second
.
Work with your partner to answer the
True or False Questions
on your paper.
How do your answers compare?
Part I
Math Skills Practice
-1
-1
-1
1)A person sitting in a boat records one upward and one downward motion every 1 second. How many waves are passing his boat each second?
Recall,
frequency
[f] is equal to the number of waves that pass through a point in 1 second. The unit of frequency is called a Hertz [Hz] and is equal to 1/s or 1s.
Answer the following questions:
2)The wind picks up and the boat is now traveling up and down 10 times every 5 seconds. What is the new frequency of the water waves?
3)Express the original frequency of the boat (from question 1) in Hz and in s :
Part II
f = n/s
Part III
Highest frequency?
Shortest wavelength?
Lowest frequency?
Part IV
Amplitude
Amplitude
Historical Views of Light
But it was Erwin Schrödinger (1887-1961) who figured it out: Light is made out of particles called photons, but it behaves exactly as a wave does.
This phenomenon is called
Wave-Particle Duality
Christiaan Huygens (1629-1695) believed light was a wave. He was able to describe how light bends as it travels through various materials, like glass and water.
Isaac Newton (1642-1727) believed light consisted of particles. He was able to show that white light can be separated into all the colors of the rainbow and vice-versa.
The Electromagnetic Spectrum
Choose the 10 most important words from this lesson and write them down.
Use each word in an informative sentence. You'll need a minimum of
5 sentences
.
Light and Color
Part V
All types of EM radiation travel at 3 x 10 meters per second. Light can travel from the Sun to us in about
8 minutes.
Speed of light =
300,000 km/s
or about
671 million mph
8
Only about
1.5%
of the EM spectrum is visible light.
What would you name a rainbow?
JAMES CLERK MAXWELL (1831-1879) was able to was able to mathematically confirm Faraday's assumptions - that light is actually composed of
oscillating
electric and magnetic fields and that this
oscillation
occurs at a finite speed - the
speed of light
!
Michael Faraday (1791 – 1867) ) was able to was able to show experimentally that electricity and magnetism were
connected
through some invisible "force field". He showed that electric currents could produce magnetism and magnets produce electricity.
Full transcript