1. Chapter 14 Objectives:
1)         Define periodic motion.
2)         Define wave including its primary purpose; include examples.
3)         Define mechanical wave.
4)         Differentiate transverse from longitudinal waves; include examples.
5)         Be able to label and explain the following parts of a wave: crest, trough, wavelength, and amplitude.
6) Incorporate wave frequency and wavelength into a wave speed calculation.

2. 7) Explain the two possible interactions a wave can have when it encounters a boundary.
Compare and contrast constructive and destructive interference.
Define standing wave. Identify both nodes and anti-nodes in a given standing wave pattern.

3. Chapter 14: Vibrations and Waves
I) Periodic Motion
* _______________: Any motion that repeats in a regular cycle.
Example:

4. II) Wave Properties
* ________: A disturbance that carries ENERGY through matter or space without actually transporting the matter with it.
* Things that travel by waves:

5. A) Mechanical Waves
* Mechanical waves require a ______________ to travel through. A medium is a space filled with matter (particles).
Examples:

6. 1) Types of Waves:
a) Transverse Waves:
Example:

7. b) Longitudinal Waves (a.k.a. Compressional
Example:

8. B) Measuring a Wave
1) The parts of a wave:
a) __________: the highest point on a wave as measured from the rest position.

9. b) _____________: the lowest point on a wave.
c) _____________________: the distance from a point on one wave to the identical point on the next wave.
d) ___________________: the height of the wave from the rest position to the crest; indicates how much energy the wave is carrying.

10. 2) Wave Speed (Velocity):
* From the original velocity formula:
we get for a wave:
Where ____ is in meters and ___ is in Hertz (Hz).

11. 3) Sample Problem: What is the wavelength of the radio wave broadcast by __________ on the FM dial? All radio waves (electromagnetic waves like: light, microwaves, gamma waves, infrared waves, etc.) travel at 3.00 X 108 m/s.
FM ( __________________ Modulation) waves are measured in Mega-Hertz , X106 Hz.

12. III) Wave Behavior
A) Waves at Boundaries
*A wave INVERTS (flips upside down) when it reflects off a more dense boundary.

13. B) Superposition of Waves
1) Wave Interference
a) Constructive Interference

14. b) Destructive Interference

15. 2) Standing Waves
*If you continue to send wave pulses that are “in phase” with each other you get:

16. and again: