1. Day 1: What is Light?
SNC 2D

2. Light and Colour

3. White Light
A Prism can separate the light into its different components – the colours of the rainbow
This is explained using the wave model theory of light
Light behaves similarly to water waves and each colour has its own frequency and wavelength

4. Sorting Types of Light by Wavelength
Every group will receive a set of cards with wavelength sizes on them
They will also receive a second set of cards with types of light
Try to match each type of light with its approximate wavelength
Then, place all your pairs in descending order

5. BUT FIRST!!!

6. Scientific Notation Review
Is used to represent very large and very small numbers
eg or x 1023
Notice the decimal is placed with only 1 number to the left of it and the number of places the decimal moved is placed as an exponent to the base 10.
If the number is large the exponent is positive

7. If the number is small, the exponent is negative
eg or
1.661 x
10-24
Express the following in scientific notation:
mm =
g =
Express the following in standard form:
5.82 x 106 cm =
4.92 x 10-5 g =
3.5 x 105 mm
5.87 x 10-7 g cm g

8. Sorting Types of Light by Wavelength
Every group will receive a set of cards with wavelength sizes on them
They will also receive a second set of cards with types of light
Try to match each type of light with its approximate wavelength
Then, place all your pairs in descending order

9. Check your Answers!

10. The Electromagnetic Spectrum
Is a wave pattern that can travel through empty space
Travels at the speed of light
Components of the spectrum with higher frequency have higher energy

11. Visible Spectrum

12. Visible Spectrum
1 nm = m then nm = m

13. Radio waves Longest wavelength – 100 Mm to 0.1 m Uses: TV broadcasting
AM and FM broadcast radio
Cell phone communication
Avalanche beacons
Heart rate monitors
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

14. Microwaves Wavelengths from 0.1 m - 1 mm Uses: Microwave ovens
Bluetooth headsets
Broadband Wireless Internet
GPS
Radar
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

15. Infrared Radiation Wavelengths 1 mm to 800 nm Uses:
Night vision goggles
Remote controls
Heat-seeking missiles
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

16. Visible Spectrum
1 nm = m then nm = m

17. Ultraviolet Wavelengths 400 nm to 1 nm Uses: Black lights
Sterilizing medical equipment
Water disinfection
Security images on money
There is one more UV slide…

18. Ultraviolet (cont.) UVA UVB and UVC Energy Highest of UV waves
Lower than UVA
Health risks
Extremely low risk for DNA damage
Can destroy Vitamin A in skin
Can cause DNA damage, leading to skin cancer
Responsible for sunburn
Table will fill in from left to right, top to bottom as you advance through. Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

19. X-rays Tiny wavelength 1 nm to 1 pm, high energy waves Uses:
Medical imaging
Airport security
Inspecting industrial welds
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

20. Gamma Rays
Smallest wavelengths – less than 1 pm, highest energy EM waves
Uses
Food irradiation
Cancer treatment
Treating wood flooring
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

21. But Just How Big ARE These Waves?
Go to to find out!

22. What is one thing that you want to know about light?
Exit Cards
What is one thing that you want to know about light?