1. 3.1 – 3.2 Properties of Electromagnetic Radiation

2. Answer the questions below!
Mini Activity
1. Find a light source where you are (ex: ceiling lights, phone flashlight)
2. Using that source of light, make a shadow with your hand
3. Draw a sketch of what you see. Make sure to include:
Light source
Hand
Shadow
4. Draw arrows from the light source to represent travelling light. Label these “light ray”
Answer the questions below!

3. Mini Activity Flashlight at 5 cm Flashlight at 30 cm Flashlight at 1 m
How bright is the light on the wall?
Find a flashlight and shine it on a wall 5 cm away. Observe and record
Slowly move away from the wall. Observe and record
Move away even further. Observe and record

4. What forms of INVISIBLE energy can you think of?
Light behaves as a wave
Light is a form of energy that is visible to us
There are many forms of invisible energy in the world as well
What forms of INVISIBLE energy can you think of?
Make a list on the board of their responses

5. Microwaves heat your food, but you cannot see the microwaves being absorbed by your food
Somehow your phone receives wifi, but you cannot see this wifi travelling through the air
UV rays and X rays can damage your body, but you cannot see them doing the damage
Infra red waves travel from your remote to your TV, but you cannot see anything between your remote and the TV

6. Electromagnetic Spectrum
The collection of these invisible and visible energies is called the electromagnetic spectrum

7. https://www. pbslearningmedia. org/resource/phy03. sci. phys. mfw
Run through this interactive with the class all together

8. Electromagnetic Spectrum Breakdown
Electromagnetic Wave
What are they used for?
Radiowaves
Transmit radio and television programs

9. Electromagnetic Wave
What are they used for?
microwaves
Heat food, transmit signals such as cell phones or satellites

10. Electromagnetic Wave
What are they used for?
infrared
Computer date and telephone calls through optical fibers, TV remotes, thermal imaging

11. Electromagnetic Wave
What are they used for?
Visible light
Vision, photography

12. Electromagnetic Wave
What are they used for?
Ultraviolet
Fluorescent lamps, security, disinfecting water

13. Electromagnetic Wave
What are they used for?
X-rays
Medical x-rays, airport security scanners

14. Electromagnetic Wave
What are they used for?
Gamma rays
Sterilizing food and medical equipment, detection of cancer and treatment

15. Look it up!
Research the different parts of a wave and fill in your notes with what you find
Fill in what they find with a pen on the board using the image provided

16. Light Travels in Waves Crest = top of the wave
Trough = bottom of the wave
Amplitude = height from rest to crest or trough
Wavelength = distance from crest to crest or trough to trough

17. Proof that Light Travels in Waves
Thomas Young demonstrated that light behaves as a wave in the 1800’s. He conducted the double slit experiment. In your notes, predict what the light will look like on the second screen by drawing it.
Watch this after prediction:
Have them complete what ACTUALLY happens
Watch this!

18. MINI ACTIVITY!!!
In groups of three complete the mini activity in your notes on waves
Go over what they found after they have worked in groups.
Mini Discussion

19. Research
Which colour from the visible light spectrum has the longest wavelength?
Which colour has the shortest wavelength?
Make sure to fill in the wavelength with the matching colour

20. Light, is it a wave or a particle?