1. 9/24 & 9/ th Grade Agenda
Learning Objective: Learn the difference between Amplitude and Wavelength
Collect: Reading & Note Taking p.30 – 31
Pass back Graded HW, Test
Text book Reading: p. 40 – 45
Video: Wave
Video: Incredible journey of the Butterfly
HW: Reading & Notetaking : p. 32 – 35
HW: Signed Grade Printout

2. Daily Reflection
Prompt: What is the crest of the wave? What is the trough of a wave? Draw a wave and label crest and trough of a wave.

3. Wave
A wave is a disturbance that transfer ene_____ from place to place.
Who can give me examples of waves?
rgy

4. Is light a wave?
Yes
But why?

5. Picture of Light Wave
Image of a pulse of light that is 2.5 billionths of a millionth of a second long

6. Energy
In science, energy is defined as the ability to do wo___. rk

7. Medium
The material through which a wave tra____ is called a medium
Who can give me examples of medium?
vels

8. Does Light Waves need a medium?
Scientist first thought that Light needed to travel through a medium. So they invented the idea of aether in space.
They look for aether in outer space but they found nothing.
So, Light Waves can travel without a medium even in a Vacuum of outer space.

9. Crest gh
Hi___ point of a wave is called a crest

10. Trough ow
L___ point of a wave is called a trough

11. Amplitude
imum
Amplitude is the max______ distance that the particles of medium carrying the wave move away from their rest positions.
Which rope has higher amplitude?

12. Wavelength
The distance between two corresp______ parts of a wave is its wavelength.
Which rope has longer wavelength?
onding

13. Frequency
Wave frequency is the num_____ of complete waves that pass a given point in a certain amount of time
ber

14. Electromagnetic Wave
An electromagnetic wave consists of vibrating electric and magnetic field that move through space at the speed of lig____ ht

15. What are some examples of electromagnetic waves?
Radio Waves
TV Signals
Microwaves
Infrared rays
Light
Ultraviolet rays
X-Ray

16. How fast do electromagnetic waves travel?
It is the fastest thing in the universe
300,000 km per second
186,000 miles per second
It takes 8 minutes for light to travel from the sun to the earth
It takes 3 million years for light to travel from the nearest galaxy (andromeda) to the earth

17. Electromagnetic Wavelength

18. How do we use Radio Waves?
Radio & TV signals
Microwave Oven
Radar
MRI
Cell phone

19. Using Microwaves
Why do you see sparks you put metal objects in a microwave?
Because of the build up of electrical energy in the metal
The long wave length of Microwaves can pass right through glass and plastic. That is why microwaves do not heat glass and plastic containers.

20. How do we use Infrared Rays?
Conventional Oven
Heat Lamps
Thermograms

21. Visible Light makes up only a small part of the electromagnetic spectrum