1. WAVES Essential Questions:
What is a wave?
How do waves travel?
What are the types of waves?
What are the properties of waves?
What are 4 types of wave interactions?

2. Day 1
The Nature of Waves

3. What are Waves?

4. What is a WAVE?
A wave is any disturbance that transfers energy through matter.
Waves only carry energy, not matter!
Once the wave has moved, the disturbance is gone.
The energy carried by ocean waves
can break rocks.

5. How do waves travel? A wave must have MATTER to travel through.
The matter through which a wave travels is called a MEDIUM

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

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

8. Electromagnetic Waves
Electromagnetic Waves are ALWAYS transverse waves.

9. Transverse Waves
waves in which the particles vibrate in an up and down motion
ex: light waves
not sure?

10. Transverse Wave
copied

11. Longitudinal Waves
waves in which the particles vibrate back and forth along the path that the wave moves.
ex: sound waves
copied

12. Carry energy along the wave
Longitudinal Waves
Carry energy along the wave

13. Day 2
Properties of Waves

14. Properties of Waves:
Amplitude
Wave Length
Frequency
Wave Speed

15. Amplitude
wave height
larger amplitude = more energy

16. Wavelength distance between 2 crests or troughs
shorter wave length = more energy

17. Frequency (Hertz / Hz)
the number of waves produced in a given amount of time
higher frequency = more energy

18. Wave Speed
speed at which waves travel through a medium

19. Properties of a wave

20. Day 3
WAVE INTERACTIONS

21. Reflection Waves reflect after hitting a barrier.
all waves can be reflected.
a wave can also be transmitted through a substance.
Reflection – happens when a wave bounces back after hitting a barrier.

22. Refraction
Refraction – is the bending of a wave as the wave passes from one medium to another at an angle.

23. Diffraction
The bending of waves around a barrier or through an opening is known as diffraction.

24. Interference Interference happens when waves overlap
Constructive: amplitude increases
Destructive: amplitude decreases

25. Resonance
Resonance – vibration produced in one object that is caused by the vibration produced in another

26. WAVES _________ ________ reflection interference types are always
properties
can undergo
WAVES
types
examples
examples
x-rays
radio waves
infrared radiation
microwaves
visible light
sound
air
water
ropes
earthquakes
tsunami waves
Print this slide and have students fill in the concept map
do _____need a __________
need a __________
are always
can be either

27. Electromagnetic Waves
amplitude
wave length
frequency
wave speed
refraction
reflection
diffraction
interference
properties
can undergo
WAVES
types
examples
Electromagnetic Waves
Mechanical Waves
examples
x-rays
radio waves
infrared radiation
microwaves
visible light
sound
air
water
ropes
earthquakes
tsunami waves
Concept Map Key
do NOT need a medium
need a medium
are always
can be either
Transverse
Longitudinal