OPENING QUESTION:
*Without* checking your notes or previous lesson plans, please sketch the 'emission' spectrum of hydrogen light using color pencils.
Compare your sketch with your team and revise as needed.
Now please make a sketch to how each of those color lines is created.... go!
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LEARNING TARGET: I will compare and contrast emission spectra with absorption spectra during today's class
WORDS O' THE DAY:
- photon (a wave AND a particle of light)
- electromagnetic waves
- energy levels
- excited (electron) = ("electrons 'jolted' into a higher energy level")
- ground state (electron) = ("electrons existing on the lowest energy level")
- Emission ("light waves are produced by an object")
- Reflection ("light waves are returned after reaching an object")
- Absorption ("some or all light waves reaching an object are retained by that object")
CALENDAR: Test on EM Waves next Thursday (June 12th) NO RETAKES (Since our seniors won't have the opportunity)
WORK O' THE DAY:
SHORT day today:
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7:30-8:10 1st period (40 minutes)
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8:15-8:55 2nd period (40 minutes)
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9:00-9:40 3rd period (40 minutes)
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9:45-10:45 4th period (40-60 minutes)
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Students who bought yearbooks will be released early from 4th period to pick them up in the commons, beginning at 10:25.
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Running Start & other off campus students can pick their books up in the commons from 10:25 to 11:55.
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10:45-11:55 Common lunch and signing party (70 minutes)
- All students will have the same extended lunch
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12:00-12:40 5th period (40 minutes)
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12:45-1:25 6th period (40 minutes)
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1:30-2:00 Spring recognition assembly
Generally speaking, every object in the Universe either ________ light, _________ light or ______ light (sometimes doing more than one at a time!)
What color light do you suppose our eyes see when the individual spectrum looks like this:
Howzabout this one?
What factors *must* we consider when evaluating the individual spectral lines and the overall color of the light we see?
In *light* of your response, do you need to re-evaluate your analysis of the previous images?
The first image is of a mercury vapor lamp and the second is a neon light. Please do a quick Google search and compare the spectra/images with the overall color you see there.
Let's discuss!
Let's revisit our opening question:
How close was your sketch to this:
With that in mind, what do you suppose created THIS:
Take a look at this REALLY COOL use of absorption spectra. Any idea what's going on there? Please discuss:
Work with your team to sketch a model that will explain how an absorption spectrum is created. GO!
Here's an interesting thought:
We discussed yesterday that plants are (usually) green because they absorb ROYGBIV light from the sun and reflect (return) green light to our eyes.
Work with your team to construct a graph (hint, it will involve curves!) that shows absorbencies on the y axis and ROYGBIV on the x axis. In other words, the graph will peak where absorbencies is highest and be lowest where absorbencies is least.
Here's a favorite video of a free diver (a particularly strenuous/dangerous endeavor where folks basically see how deep they can dive on one breath of air. That is simplifying things a LOT, however)
Please pay attention to the color of the divers' surroundings. What happens as he gets deeper and deeper?
Work with your team to sketch a curve of the absorption vs depth vs ROYGBIV (I'm not quite sure how to do that myself so I thought I'd see what you folks can come up with!)