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Wave Unit’s Defining Concept: Waves are disturbances that transfer energy without transferring matter. Sound is a mechanical waves and therefore needs a medium in order to transfer energy. Electromagnetic waves such as light do not require a medium. It is these waves that are messengers from the universe. Substantially all understanding of our universe comes from an ability to interpret information found within waves that reach us here on Earth or instruments operating in space. Understanding the characteristic properties of all waves, including mechanical waves, allows us to describe and predict what will happen when waves interact with matter and/or other waves.
Wave Unit’s Defining Concept: Waves are disturbances that transfer energy without transferring matter. Sound is a mechanical waves and therefore needs a medium in order to transfer energy. Electromagnetic waves such as light do not require a medium. It is these waves that are messengers from the universe. Substantially all understanding of our universe comes from an ability to interpret information found within waves that reach us here on Earth or instruments operating in space. Understanding the characteristic properties of all waves, including mechanical waves, allows us to describe and predict what will happen when waves interact with matter and/or other waves.
Waves Intro 21-22 a.movVideo #1: Waves Intro (1 of 2)
(Dec 16-17) First part of PowerPoint presentation shown in class to reinforce your introduction to waves. Your introduction came by completing Handout #27.
Waves Intro 21-22 b.movVideo #1: Waves Intro (1 of 2)
(Dec 16-17) Second part of PowerPoint presentation shown in class to reinforce your introduction to waves. Your introduction came by completing Handout #27.
ROYGBIV.movVideo #3: Slinky Lab & Energies Within ROYGBIV
(Dec 18-19)
Round-up for pages 7-8 on the Slinky Lab. You now recognize that there is a relationship between a wave’s energy and its wavelength. It is of great importance that you are able to explain why red has the least energy and violet the most.
EMR 2023-24 1.movVideo #4: Electromagnetic Radiation (EMR)
Thursday - Friday: Jan 2-3
Recording (1 of 4) of PowerPoint presentation to class on the seven forms of EMR emitted by our sun.
EMR 2023-24 2.movVideo #5: Electromagnetic Radiation (EMR)
Thursday - Friday: Jan 2-3
Recording (2 of 4) of PowerPoint presentation to class on the seven forms of EMR emitted by our sun.
EMR 2023-24 3.movVideo #6: Electromagnetic Radiation (EMR)
Thursday - Friday: Jan 2-3
Recording (3 of 4) of PowerPoint presentation to class on the seven forms of EMR emitted by our sun.
EMR 2023-24 4.movVideo #7: Electromagnetic Radiation (EMR)
Thursday-Friday: Jan 2-3
Recording (4 of 4) of PowerPoint presentation to class.
All the sun's EMR absorbed by earth must be sent back to outer space. Three relatively strong waves are absorbed while a weak wave is sent back to outer space. This is the basic physics of basic physics of climate change. Choose to be scientifically literate.
RGB Sensitivity 2022-23.movVideo #8: RGB & Our Eyes
Monday-Tuesday (Jan 6-7)
What are RGB codes and how do they correspond to our eyes?
RGB Shading In.movVideo #9: RGB Shapes
Tuesday, Jan 7
Handout #34 was sent to you via Canvas. Here are the recorded instructions. You will be using hex codes for the custom shading of three objects with your really interesting-named colors. But don't forget to include the RGB numbers.
Rayleigh Yellow Sun 1.movVideo #10: White Light, Yellow Sun #1
Wednesday, Jan. 8
Recording of Handout #34 presented in class. So, most of you now agree that the sun emits white light. It is a giant white light bulb. Well then, why does the sun appear yellow at times.
The reason our sun can appear different shades of red, orange and yellow can be explained by:
1. The nitrogen (N2) and oxygen (O2) molecules that make up 99% of earth’s atmosphere scatter visible light waves.
2. Shorter wavelengths scatter more easily (BIV).
3. Longer wavelengths scatter less (ROY).
Rayleigh Yellow Sun 2.movVideo #11: White Light, Yellow Sun #2
Wednesday, Jan. 8
Recording of Handout #34 presented in class.We sometimes see the sun yellow because the shorter wavelengths of visible light (blues & violets) get scattered high in the atmosphere. If the reds and most of the mid range colors (greens) make it to our eyes, we see some form of yellow. That's it! Scattering.
Sunrise Sunset 2023-24.movVideo #12: Sunrises & Sunsets
Recording of Handout #35 presented in class.
Thursday, Jan 9
Yes, our atmosphere is a scatter zone. Shorter wavelengths scatter much more than longer wavelengths. But why at sunrise or sunset, can we see the sun as a deep yellow, orange or even red? Why? It has everything to do with that scatter zone and how long light travels through it.
Video #13: Blue Skies
Recording of Handout #36 presented in class.
Thursday, Jan 9.
So the sky is blue because the shorter wavelengths of light (BIV) scatter up to ten times more the longest wavelengths of visible light (reds). But in order to see blue, those wavelengths somehow have to enter our eyes.
Blue Oceans 2022-23.movVideo #14: Why Oceans Appear Blue
Tuesday, Jan. 23 -- Recording of Handout #41 presented in class, So, water is transparent yet our oceans appear blue. How does a red apple turn black, then back to red again?
Red Fish Safer.movVideo #15: Is a Red Fish Safer Than a Blue Fish?
Wednesday, Jan. 24 -- And why are red fish safer in deep water? Indeed they are!
Messengers.movVideo #16: As I Was, Not As I Am
Tuesday, Jan 14
We see the universe the way it was, not the way it is. Light waves travel at the speed of . . . light. Nothing travels faster. OK, but light waves still have to reach us before they can be interpreted.
A light year is the distance light travels in a year. 186,000 x 60 x 60 x 24 x 365.25 = 5.9 trillion miles or 9.5 trillion kilometers.
Video #17: Light Bulb Observations
Wednesday - Friday, Jan 15-17
Sound 2023-24 1.movVideo #18: Sound Intro
Wednesday, Jan. 22
Recording of the PowerPoint presentation (Handout #41) shown in class to reinforce your reading assignment (Handout #40).
Doppler.movVideo #19: The Doppler Effect
Thursday, Jan. 23
Why does an approaching fire truck’s siren sound differently when it passes by? The Doppler effect also applies to light and allows us a much greater understanding of our universe.
Video #20: Constructive Wave Interference
Friday, Jan. 24
Short and simple demonstration of waves joining up with each other to produce a larger wave (larger amplitude).
Video #21: Constructive Wave Interference (Again)
Friday, Jan. 24
Slo Mo Guys making use of an extremely large wave pool to show how spike waves can be generated through constructive wave interference. This is NOT how noise cancelling headphones work. Got it? It's actually the opposite of cancelling.
Constructive Destructive.movVideo #22: DESTRUCTIVE Wave Interference
Friday, Jan. 24
Shorty of the PowerPoint shown in class.
So, how do Bose Noise Cancelling headphones work? They certainly don't use constructive wave interference.
Rainbows 2023-24 1.movVideo #23: Rainbow Formation #1
Tuesday Jan 28
Recording of the PowerPoint presentation in class. So, why are rainbows so rare? Where do you, the sun and rain need to be?
Rainbows 2023-24 2.movVideo #24: Rainbow Formation #2
Tuesday Jan 28
Recording of the PowerPoint presentation in class. Here we examine light as it refracts when entering a raindrop, reflects off its back, and refracts again as it leaves the raindrop. Errr. Problem is that red is the lowest color band leaving the drop and violet the highest band.
Rainbows 2023-24 3.movVideo #25: Rainbow Formation #3
Tuesday Jan 28
-- Recording of the PowerPoint presentation in class. Welcome to the Rainbow Show! We need a wall of rain, not a few drops. If red leaves at the bottom of a raindrop, how is red at the top of every rainbow? Welcome to the rainbow show!
As I Was 2022-23.movVideo #19: As I Was, Not As I Am
Fri., Jan. 26 - We see the universe the way it was, not the way it is. Light waves travel at the speed of . . . light. Nothing travels faster. OK, but light waves still have to reach us before they can be interpreted.
A light year is the distance light travels in a year. 186,000 x 60 x 60 x 24 x 365.25 = 5.9 trillion miles or 9.5 trillion kilometers.
James Webb 2023-24 1.movVideo #25: JWST #1
Friday, Feb. 2
James Webb 2023-24 2.movVideo #26: JWST #2
Friday, Feb. 2
James Webb 2023-24 3.movVideo #27: JWST #3
Friday, Feb. 2
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