OPENING QUESTION: What is an electromagnetic wave?

• How is it similar to an ocean wave?
• How is it dissimilar to an ocean wave?

LEARNING TARGET: Student-led conversations:

Review how photons are created

Learn the form of e-m waves

Review 'quantum jumps'

Review the importance of 'energy levels'

c=λυ???

Review "Rowdy Martians"

All objects in the Universe do... WHAT (regarding light). Hint: There are 3 that we are most interested in and 2 that we are sorta kinda interested in passing.

WORDS O' THE DAY:

• electromagnetic waves
• electron REST state or GROUND state
• EXCITED electrons
• quantum jump
• energy levels

FORMULAE OBJECTUS:

c=λυ: The speed of light (c) = wavelength (λ named "lamda") x frequency υ named "nu") Physicists LOVE to use greek letters... something you'll learn first hand if you take UPhys in your college careers!

it is often helpful to remember that for waves generally:

s = wf: The speed of a wave (s) = wavelength x frequency)

 

WORK O' THE DAY:

Please work with your team to find an animation for an electromagnetic wave.

Let's discuss.

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Get out a piece of paper. Write your name, period, date

1. List the electromagnetic spectrum from highest to lowest energy

2. Next to each of those types of EM wave list one (and only one) way that we as human beings experience that type of light.

3. Describe how a 'typical' visible light photon is created.

4. True or False... a photon of light is created when an electron becomes excited and jumps to a higher energy level

5. Everything in the Universe either:

6. _________________, _________________, _________________ oh and there are two other aspects that we are a bit less interested in:

7. _________________ & ________________.

8. You have 5:00 minutes to complete those tasques... GO

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Background:

the speed of light can be found by multiplying the wavelength of that light wave and it's frequency using our new old friend:

c=λυ

where c = the speed of light in m/s

λ = the wavelength in meters/wave

υ = the frequency in waves/sec also sometimes called 'hertz'

For your perusal:

please calculate the speed of light for an xray with wavelength of 10.0 nanometers and frequency of 3.00 ×10¹⁶ Hz

now please calculate the speed of light for an microwave with frequency of 300 MHz and wavelength of 1.00 m

Here's an interesting question, is the speed of light ALWAYS the same:

3.00 x 10⁸ m/s ??

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POP QUIZ: write down the EM Spectrum in order of highest to lowest wavelength... 30 seconds... GO!

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Here's perhaps a better way to ask that question, when is the speed of light NOT = to

3.00 x 10⁸ m/s ??

 

Work with your group to sketch an electromagnetic wave (that's the technical term for a light wave)

 

Notice that an electromagnetic waves have an electric wave and a magnetic wave component. Those components move exactly the same, except that they are 90 degrees apart:

 

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Let's reassemble ourselves by color dots.

Folks designation by the color Green: Please do a wee bit of research and find graphs, animations or other images to show how human generated radio waves are created.

Folks designation by the color Green: Please do a wee bit of research and find graphs, animations or other images to show how the microwaves in our phones are created.

Folks designation by the color Green: Please do a wee bit of research and find graphs, animations or other images to show how human generated ultra violet waves are created.

Folks designation by the color Green: Please do a wee bit of research and find graphs, animations or other images to show how human generated x-rays are created.

Please paste a picture and a short blurb (NO COPYING AND PASTING SENTENCES) on the appropriate slide HERE