Chapter 14 Objectives: 1) Define periodic motion.

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Presentation transcript:

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.

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.

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

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

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

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

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

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

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.

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

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.

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

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

b) Destructive Interference

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

and again: