1. http://media-cache-ec0. pinimg
Investigating Waves

2. Phenomenon

3. Overarching Question: Why are we able to hear the sound but not see the light?
Beginning ideas/mental model
Discussion – what do we need to know in order to explain the phenomenon?

4. Part I: What are waves, and how do they transfer energy?
Beginning Ideas
Investigations
Discussion

5. Types of Waves Video Clip of Types of Waves – see desktop Transverse
Longitudinal
Transverse
Water Waves
Video Clip of Types of Waves – see desktop

6. Electromagnetic Wave
From:

7. Sound waves vs. light waves
Sound waves: mechanical waves
Restorative force = molecules returning to equilibrium
Light waves: Electromagnetic waves
Restorative force = propagation by interactions between electric field and magnetic field

8. Wave energy intensity vs. distance
From:

9. Part I: Terminology
Wave pulse
Periodic wave
Mechanical wave
Electromagnetic wave
Medium
Transverse waves
Longitudinal waves
Energy transfer
Disturbance
Restoring force
Equilibrium

10. Part II: What are identifying characteristics of waves, and what factors influence them?
Beginning Ideas
Investigations
Discussion

11. Wave Properties

12. Terminology & Units
Frequency (f): cycles/second (hertz) (Hz) Wavelength (λ): meters Wave Speed (V): meters/second Amplitude: Depends on the type of wave : Water wave: amplitude is a displacement (distance) Sound wave: amplitude is in terms of loudness (air pressure) Light wave: amplitude is in terms of brightness (intensity) Audible Sound λ: Visible Light :

13. Wavelengths of Musical Notes
Frequency (Hz)
Wavelength (cm) C4
261.63
131.87
 C#4/Db4 
277.18
124.47 D4
293.66
117.48
 D#4/Eb4 
311.13
110.89 E4
329.63
104.66 F4
349.23
98.79
 F#4/Gb4 
369.99
93.24 G4
392.00
88.01
 G#4/Ab4 
415.30
83.07 A4
440.00
78.41
 A#4/Bb4 
466.16
74.01 B4
493.88
69.85 C5
523.25
65.93

14. Wavelengths of Visible Light

15. What influences properties of waves?
Beginning Ideas
Investigations
Discussion

16. Relationships Wave formula: V = fλ Wave Formula: V = fλ
Amplitude: Amount of energy applied

17. Relationships (cont.) Speed and Medium
Speed of a wave depends on the elasticity or stiffness of the medium
Sound (m/s)
Light (m/s)
Water
1,498
224,310,000
Air
343
299,700,000
Vacuum
299,792,458

18. Part III: What happens to wave energy when it encounters a barrier?
Beginning Ideas
Investigations
Discussion

19. Reflection of Waves

20. Diffraction of Waves
From:

21. Tying it all together – explaining the phenomenon

22. Thank you
Contact information: Annmarie Ward: Leah Bug: