starter: what is light? ( you need to write an answer for this one) goal: get some understanding of...
TRANSCRIPT
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•Starter: What is Light? ( you need to write an answer for this one)
•Goal: get some understanding of what light is and the spectrum of electromagnetic waves.
•Today we continue our discussion on Waves, simply moving into a new area of waves.
Good Morning! 04/20/23
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First we need to finish the worksheet from yesterday on
Sound waves.
Link to PPT
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We are going to split up and do the worksheet on the laptops
The rest will be going through a Powerpoint (.ppt) on the screens.For those going to the laptops you will be going to the usual place. Science Shares Folders Durand then open the word doc. “EMSpectrumLink”
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Light is a crazy thing that we may never understand, but let me tell you what we
do know.•Light travels as a wave, a transverse, Electromagnetic Wave.•It can behave as a particle•It travels faster than anything in the universe!•It is impossible for us to travel faster than the speed of light.
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The Back Story
Why does light travel so fast?
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• The difference between a wave and a particle might seem obviousa wave is a disturbance that carries energy, and a particle is a piece of matter.
Waves and Particles12.112.1What are electromagnetic waves?What are electromagnetic waves?
• However, in reality the difference is not so clear.
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• In 1887, Heinrich Hertz found that by shining light on a metal, electrons were ejected from the metal.
Waves and Particles12.112.1What are electromagnetic waves?What are electromagnetic waves?
• Hertz found that whether or not electrons were ejected depended on the frequency of the light and not the amplitude.
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• Because the energy carried by a wave depends on its amplitude and not its frequency, this result was mysterious.
Waves and Particles12.112.1What are electromagnetic waves?What are electromagnetic waves?
• Years later, Albert Einstein provided an explanationelectromagnetic waves can behave as a particle, called a photon, whose energy depends on the frequency of the waves.
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• Because electromagnetic waves could behave as a particle, others wondered whether matter could behave as a wave.
Particles as Waves12.112.1What are electromagnetic waves?What are electromagnetic waves?
• If a beam of electrons were sprayed at two tiny slits, you might expect that the electrons would strike only the area behind the slits, like the spray paint.
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• Instead, it was found that the electrons formed an interference pattern.
Particles as Waves12.112.1What are electromagnetic waves?What are electromagnetic waves?
• This type of pattern is produced by waves when they pass through two slits and interfere with each other.
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• Water waves produce an interference pattern after passing through two openings.
Particles as Waves
• It is now known that all particles, not only electrons, can behave like waves.
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Electromagnetic Waves
Believe it or not, you are being “showered” all the time, not by rain but by waves.
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What Is an Electromagnetic Wave?
An electromagnetic wave consists of vibrating electric and magnetic fields that move through space at the speed of light.
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How do sunglasses work?
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An analogy for sunglasses
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Electromagnetic Waves
Click the Video button to watch a movie about electromagnetic waves.
The Nature of Electromagnetic Waves
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Electromagnetic Waves Activity
Click the Active Art button to open a browser window and access Active Art about electromagnetic waves.
Waves of the Electromagnetic Spectrum
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Waves of the Electromagnetic Spectrum
What Is the Electromagnetic Spectrum?
The electromagnetic spectrum is the complete range of electromagnetic waves placed in order of increasing frequency.
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Electromagnetic Waves
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Electromagnetic Spectrum
Click the Video button to watch a movie aboutthe electromagnetic spectrum.
Waves of the Electromagnetic Spectrum
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Please turn in your Worksheet on Electromagnetic Spectrum
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Radio and Television
In AM transmissions, the amplitude of a radio wave is changed. In FM transmissions, the frequency is changed.
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Comparing Frequencies
WirelessCommunication
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In the cellular phone
system, cellular phones transmit
and receive radio
waves that travel to
the nearest tower.