1. Waves Review

2. What are the two things that are not matter?
Do Now
What are the two things that are not matter?

3. What is a WAVE?
A wave is any disturbance that transfers energy through matter or space.
Once the wave has moved, the disturbance is gone.
The energy carried by ocean waves
can break rocks.

4. The matter through which a wave travels is called a MEDIUM.
How do waves travel?
The matter through which a wave travels is called a MEDIUM.

5. Types of Waves

6. Transverse Wave waves in which the particles vibrate in an
up and down motion
ex: light waves
Transverse Wave
highest point
rest position
not sure?
lowest point

7. waves in which the particles vibrate back and forth in compressional pulses
ex: sound waves
Longitudinal Wave
not sure?

8. Mechanical Waves need a medium to travel through.
Examples of Mechanical Waves:
sound
water
ropes
earthquakes
Mechanical Waves can be either Transverse or Longitudinal

9. Electromagnetic Waves do NOT need a medium to travel through.
Examples of Electromagnetic Waves:
x-rays
radio waves
infrared radiation
microwaves
visible light
Electromagnetic Waves are ALWAYS Transverse!

10. Properties of Waves

11. Amplitude = wave height
larger amplitude = more energy

12. Wavelength = distance between 2 crests or troughs
shorter wavelength = more energy
human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers

13. Frequency = the number of waves that pass by a point each second (Hertz)
higher frequency = more energy

14. Light Waves
Extension

15. Consists of changing electric & magnetic fields
Light is a type of energy that travels as an electromagnetic wave.
Consists of changing electric & magnetic fields
Can travel through empty space or matter

16. Opaque Translucent Transparent
Transmission: Occurs when light waves pass through an object without interacting.
Opaque no
light
Translucent
some
light
Transparent
they see everything!

17. Light interacts with matter in different ways:
WAVE DISTURBANCES
Light interacts with matter in different ways:
Absorption: Occurs when light waves transfer energy into particles of matter.
When incoming light hits an object it causes its atoms to vibrate. It then converts the energy into heat which is radiated.
Light stops at the object and does not reflect or refract.
I can explain when light interacts with matter it is: absorbed, transmitted, refracted or reflected (scattered)

18. Refraction: is the bending of a wave when it changes speed as it travels from one material(medium) to another.
The bending of a wave as the wave passes between two substances in which the speed of the wave differs

19. Reflection: Occurs when light waves bounce off of an object.
Bananas appear yellow because the yellow wavelength is being reflected. All of the other colors of light are being absorbed into the bananas.