80 ĐỀ THI THỬ TUYỂN SINH TIẾNG ANH VÀO 10 SỞ GD – ĐT THÀNH PHỐ HỒ CHÍ MINH NĂ...
Ccps light energy workshop #3
1. Light
energy
Using Hands-on Technology to “Energize” Elementary Teachers’ Physics Instruction
February 22, 2018
Presented by Dr. Dena Harshbarger & Dr. Mariana Lazarova
Facilitated by Dr. Phu Vu & Dr. Dick Meyer
Funded by Nebraska’s Coordinating Commission for Postsecondary Education (CCPE) Grant
2. Numbered heads together
What ideas did you try from Workshop #2
★ How did it go?
★ How did students respond?
★ Did you note any impact on learning? Explain.
3. Two stay, two stray...
What ideas did you try from Workshop #2
★ How did it go?
★ How did students respond?
★ Did you note any impact on learning? Explain.
5. Most importantly...
Enjoy the Learning Experience
● Take comfort breaks as needed
● Ask questions
● Share ideas
● Share answers. Don’t be afraid of
being “wrong”.
7. Connection to NEbraska Science standards NE
Science Standards
● SC5.1.1 Students will combine scientific processes and knowledge with scientific
reasoning and critical thinking to ask questions about phenomenon and propose
explanations based on gathered evidence.
● SC5.2.2 Students will identify the influence of forces on motion.
❖ SC5.2.2a Describe motion by tracing and measuring an object’s position over a
period of time (speed).
❖ SC5.2.2b Describe changes in motion due to outside forces (push, pull, gravity)
❖ MA 5.4.2 Analysis & Applications: Students will analyze data to address the situation.
➢ MA 5.4.2.a Use observations and experiments to collect, represent, and interpret the data using tables and bar
graphs.
8. pedagogical knowledge
Teaching practices that enhance science instruction
1) Incorporate hands-on investigations
● Light Kit
● Lasers and color filters
2) Incorporate technology
● PhET simulations
● Newsela
● Plickers
3) Actively engage students in collaborative learning
● Table Talk (# cards)
● 2 Stay, 2 Stray
● Show Down
● Spend a Buck
9. Reminder: Science logs/journals
● Develop learners’ scientific process skills (i.e., predicting,
inferring, observing, recording and analyzing data/results,
and communicating)
● Helps students process & recall information
● Serves as study guides and/or student resources
● Can be used to assess students’ understanding
● Interactive notebooks are more engaging!
***Please use your science log throughout the day and
consider how you can use journals with your students.
11. What is Light?
3rd grader:
Light is something that makes
things visible
Physics
review
12. This is the Sun’s spectrum
in the visible part of the light spectrumPhysics
review
13. 13
Light encodes info about:
1. what objects are made of
2. how hot objects are
3. how fast they are moving
4. what they are: galaxy, star, planet, etc.
Hubble ultra Deep Field Credit: NASA
Physics
review
14. 14
WHAT IS LIGHT?
• Light is a form of energy
• Light has dual nature: sometimes acts like a wave and sometimes like a
particle
• Light is an electromagnetic wave
• The particles of light are massless photons
• The Energy, Wavelength, and Frequency of light are related
• The Speed of light is constant, c = 300,000 km/s (or 186,000 miles/s, a
million times faster than sound in air) – the speed limit of the Universe
How is light produced?
1. originates from accelerating charges
2. election transitions in atoms
15. Electromagnetic Radiation = Light
Electromagnetic wave
• A traveling packet of energy
• made up of vibrating electric and magnetic fields that
regenerate each other by electromagnetic induction
Physics
review
16. Potential E
Stored Energy
Kinetic E
Energy of Motion
Radiative E
Light
1. Food
2. Nuclear energy
3. Hot water
4. Object lifted high
5. Compressed spring
TYPES OF ENERGY
Energy is never created or destroyed,
just converts from one type to another.
Sort these into
the energy
category they
belong to:
A. Gasoline
B. Radio waves
C. Voltage
D. Magnet
E. Mass
Physics
review
17. 17
The Wave-Particle Duality of Light
WAVE:
- properties
(Wavelength,
Amplitude,
Frequency, Speed)
WHAT IS LIGHT?
- Interactions (diffraction & interference)
PHET simulations!
Physics
review
18. 18
PARTICLE: the photon has no mass!
- interactions impart momentum
photons
electrons
metal
WHAT IS LIGHT?
Photoelectric effect
PHET simulation
The Wave-Particle Duality of Light
Physics
review
19. The Electromagnetic Spectrum of Light is Infinite
Listed in order of Energy, Frequency, Wavelength
Planck’s constant
speed of light
Physics
review
20. 20
How are wavelength and frequency related?
A) the longer the wavelength, the lower the frequency
b) the shorter the wavelength, the lower the frequency
C) the longer the wavelength, the higher the frequency
D) Wavelength and frequency are independent
WHAT IS LIGHT?Physics
review
21. 21
How are energy and frequency related?
A) the higher the energy, the lower the frequency
b) the lower the energy, the higher the frequency
C) the higher the energy, the higher the frequency
D) energy and frequency are independent
Planck’s constant
WHAT IS LIGHT?Physics
review
22. 22
Q: Which light wave has the highest energy?
A)
B)
C)
D)
E)
Q2: Which has the longest wavelength?
hysics
review
23. 23
Can you hear RADIO WAVES?
A) No
B) Yes
C) Some people can
D) Only Jodie foster can
Physics
review
24. 24
Can you hear RADIO WAVES?
A) No
B) Yes
C) Some people can
D) Only Jodie foster can
Physics
review
Sound is a pressure wave.
Sound is a longitudinal wave
Sound needs a medium to travel.
Light is an electromagnetic wave.
Light is a transverse wave.
Light can travel in vacuum.
25. How does light interact with matter?
matter ................................. light
absorbs
emits
reflects / scatters
transmits
refracts (bends)
https://phet.colorado.edu/sims/html/color-vision/latest/color-vision_en.html
Physics
review
27. The electron energy levels are quantized
• light “fingerprints”: the energy levels differ from atom to atom and ion to ion
1) light is emitted when electrons transition between energy levels
Emission
spectrum
Absorption
spectrum
28. each electron
in each element produces
a UNIQUE spectral line
DURING TRANSITIONS
Physics
review
29. 3 Main Types of Spectra
continuous absorption emission
Absorption or Emission?
•depends on temperature and density
hot
dense
object
cooler
low-density
gas
hot
dense
object
hot
low-density
gas
Physics
review
30. molecules vibrate and rotate
electrons spiraling in magnetic fields
2) light is emitted when charges accelerate
Physics
review
31. Solar Spectrum:
Plot of intensity of light vs. Wavelength
Wavelength
intensityoflight
Physics
review
32. blackbody radiation depends only on Temperature
Peak emission depends
on TemperatureONLY
Physics
review
- the redder, the cooler
- the bluer, the hotter
i.e., hot things emit
more energy than
cool things
Thermal radiation = Blackbody radiation
33. Does a blue star emit red light?
A) Yes
B) No
C) It depends
Does a blue star emit more
red light than a red star?
A) Yes
B) No
Physics
review
36. Safety precautions:
● Avoid placing materials near your
mouth or eyes.
● Be aware of and handle sharp objects
with care (corner of mirrors, prisms).
● Use materials appropriately.
● Do not look directly into sunlight or
laser beams.
37. Cha n 1: How i h T av ?
Materials:
● Mirror
● Protractor
● Light Kit Laser beams
*What happens to the light when it hits the mirror?
38. Reflection
Law of reflection:
• angle of incidence = angle of reflection
Physics
review
2) Diffuse reflection
• light striking a rough or
irregular surface reflects in
many directions
1) Specular reflection
39. Cha n 2: Wha p s en
Lig s ik f e n je s?
1. Discuss your predictions
with your table team.
2. Test each object.
3. Record results.
40. Discussion:
Find SOMEONE WHO SITS AT A DIFFERENT TABLE
1. Which objects block some light? How do those objects
compare to the ones that allow all light to pass through?
2. Which objects block all light? Is this what you predicted?
Why or why not?
3. What evidence is there that no light passes through some
objects?
41. Ex e n e B re L
1. Builds background
experience
2. Helps students
make meaningful
connections
3. Improves retention
and recall
43. Transparent and Opaque Materials
Light is transmitted similar to sound
• light incident on matter forces some electrons in matter to vibrate
Physics
review
• energy is momentarily absorbed and vibrates electrons in the glass
• a vibrating electron either emits a photon or transfers the energy as heat
• light slows due to time delay between absorption & reemission of photons
44. Speed of Light is constant!
Average speed of light through different materials
• vacuum—c (300,000,000 m/s)
• air—slightly less than c (but rounded off to c)
• water—0.75 c
• glass—0.67 c
• diamond—0.41 c
Physics
review
46. Transparent and Opaque Materials
• Light incident on:
• dry surfaces bounces directly to your eye
• wet surfaces bounces inside the transparent wet
region, absorbing energy with each bounce, and
reaches your eye darker than from a dry surface
Why do wet
thing look
darker?
Physics
review
47. hOw can we represent the vocabulary words to
help students understand & remember them
better?● Examples/Non-examples
● Analogies
● Drawings or visuals
● Actions, movement,
simulations
● Songs or poems
● Frayer’s Model
● Models or sculptures
48. Sort the objects based upon
your findings.
Transparent Translucent Opaque
51. PA T E C L E #3 - Par
11. Would you consider a paper towel as translucent,
transparent, or opaque?
2. SHOW RESPONSE WITH PLICKER CARD
3. Explain your response.
4. What could we do to the paper towel to change the way light
interacts with it?
Hint: Is there a way to make the paper more transparent?
52. PA T E C L E #3
PA 2- FO B O
OPEN-ENDED DISCOVERY:
1. What effects did the oil have on the paper?
2. Is the paper more or less transparent when wet?
57. EX R O Y L GE 5:
Par 1: Pap
Outdoors if possible1. What happens when white light reflects off of white paper?
2. What happens when white light reflects off of black paper?
3. What happens when white light reflects off of red paper?
4. What happens when white light reflects off of blue paper?
5. Which color of paper had the brightest reflection? Why?
58. EX R O Y L GE 5
Par 2: Ad il s
Outdoors if possible
1.
2. What kinds of objects reflect light?
3.
Whgat
1. Use the red filter to look at the white paper.
● What color is the paper?
2. Use the blue filter to look at the white paper.
● What color is the paper?
3. Use the blue filter to look at the red paper.
● What color is the paper?
4. Use the red filter to look at the blue paper.
● What color is the paper?
5. Think about how color filters work.
59. EX R O Y L GE 5
Par 3: Pen t ug l s
Outdoors if possible
1.
2. What kinds of objects reflect light?
3.
Whgat
1. Draw a circle on a white paper with the pink highlighter.
● Look at the circle through the red/blue filter. What do you see?
2. Draw a circle on a white paper with the blue highlighter.
● Look at the circle through the red/blue filter. What do you see?
3. Use the color filters to look at multi-colored images in the room.
4. Now, think about how color filters work.
60. PA C LE 5
OPEN-ENDED DISCOVERY:
1. Is a red sheet always red?
2. What can you conclude about how colors add and
subtract?
(Show artwork video from phone)
65. Cha n 6: Pri l
● What do you see when we look at light that has passed through a
prism?
● Will the light source make a difference in what we see?
● What colors make up the Sun’s light?
Sunlight Artificial Light (i.e., flashlight)
Vs. vs.
66. Dispersion
• Dispersion
• process of separation of light into colors arranged
by frequency
• Components of white light are dispersed in a prism
(and also in a diffraction grating)
Physics
review
Outside activity:
Solar glasses + diffraction grating
glasses
69. 1. What happens to the happy face when you put
water in the glass?
2. Why can’t you see the happy face on the bottom
when you at it from the side of the glass filled with
water?
70.
71. 1. What does the pencil look like in the cup of
water? Does the pencil look longer or
shorter underwater? Why?
2. Where does the pencil appear to be broken?
73. Refraction
• Refraction
• bending of light when it passes from one medium to another
• caused by change in speed of light
• Illusions caused by refraction
Physics
review
74. Speed of Light is constant!
Average speed of light through different materials
• vacuum—c (300,000,000 m/s)
• atmosphere—slightly less than c (but rounded off to c)
• water—0.75 c
• glass—0.67 c, depending on material
• diamond—0.41 c
Physics
review
Speed = distance / time
75. Refraction
Light bends when going from one transpare
medium to another
because
Light moves SLOWER in HIGH density
than in low density medium
From HI to LO
AWAY from normal
air
water
From LO to HI
TOWARD the normal
Physics
review
77. Cha n 8: Len -Par 2
OPEN-ENDED DISCOVERY:
1. Explore how the concave and the convex lenses work.
2. Use the 3-beam laser to find the focal point of each lens.
3. Connect to vision correction.
78. Lenses
o=object distance i=image distance
The image can be:
• Large or Equal or Smaller
• Real or Virtual
• Upright or Upside-down
• On same or opposite side as object
Physics
review
81. WORKSHEET:
Use the optics kits to find the focal length of the lens.
Use pen, paper & ruler: draw an imaginary object
and form the image from the principal rays through the
lens.
PHET simulation: Geometric Optics:
https://phet.colorado.edu/sims/geometric-optics/geometr
ic-optics_en.html
Cha n 9: Len - Ima r a n
83. How the Eye Sees Color and What color is the Sun?
https://phet.colorado.edu/en/simulation/color-vision
Our eyes don’t see blue as
well as Green and Red
WHITE LIGHT
Physics
review
86. Explore
Polarization
How do polarizer work?
Explore orientation to find when two polarizers:
● Block all light
● Transmit all light
● Transmit some light
91. • What is something new you’ve learned
today?
• What is an idea you’d like to try in your
classroom?
92.
93.
94.
95. How do you plan to invest your time and energy
in order to improve your science instruction?
Cooperative Learning
Structures
Ex. Jot Thoughts, inside/outside
circle, Think-Pair-share ….
Hands-on & Inquiry-based
investigations investigations
Technological Tools to engage
and enhance learning
Ex. Phet, iPad apps, Plickers…..)
Building Scientific Content
Knowledge/Background
Ex. Light Energy, Force & Motion,
Electricity
96. Tha y o p ci n i r C S im v s i c G a t
We p ci o r ic o t en uc o !
Have a great rest of
the school year!
Best Wishes!
