1. - sound in air - AC electricity in a wire -an earthquake in rock -ocean waves in water radio waves - light - infrared radiation - X-rays - gamma rays -microwaves -- UV (ultraviolet) Key Points: 1. Learn the characteristics of Transverse and longitudinal Waves. 2. Understand how waves are created and propagated. 3. Understand the properties of waves.

2.  phenomenon by which energy propagates through a distance as a result of vibrational motions

3.  Electromagnetic: these waves do not require a medium in which to travel. Light is an example of this. You will study these in Physics 30.  Mechanical: these waves do require a medium in which to propagate.

4.  Longitudinal waves: the particles of the medium vibrate parallel to the direction of energy travel (cannot be polarized)  Transverse waves: the particles of the medium vibrate perpendicularly to the direction of energy travel, (can be polarized)

5.  particle displacement is parallel to the direction of wave propagation. ENERGY WAVE Equal Spacing

6.  Compression: is the region of higher concentration of the medium compared to the mean position.  Rarefaction: is the region of lower concentration of the medium compared to the mean position. Node: a stationary point in a vibratory body where the amplitude is zero. *** Everything that can be said about a longitudinal wave can also be said about a transverse wave with polarization being the only exception.

9.  particle displacement is perpendicular to the direction of wave propagation.

10. Node Energy

12.  Amplitude: the maximum displacement of the medium from the mean or zero position.  Pulse: a single displacement of the medium  Cycle: a repetition in the wave.  Crest: the maximum positive displacement from the mean position  Trough: the maximum negative displacement from the mean position. Opposite side of the crest.

13.  Wavelength: it is the lateral displacement traveled during one cycle. (λ)  Frequency: the number of cycles per unit time (Hz)  Period: the time it takes to complete one cycle (s)  Node: A stationary point in a vibratory body where the amplitude is ze ro.  The period and frequency of a wave are related by the equation

14. Waves are an example of SHM because they repeat over and over just like a mass on a spring or a pendulum. As shown below, a mass on a spring makes a sinusoidal wave pattern as it oscillates.

15.  The universal wave equation links the velocity of a wave, the wavelength and the frequency of a wave in the following manner. Velocity depends upon the medium through which the wave is traveling.  Velocity is constant for a given medium so:

16.  Example 1 : A wave has a velocity of 70.0 m/s and its frequency is 10.0 Hz. What is the wavelength?

18.  Read TextbookPages 392-410  Do Workbook p. 280 #5, 6, 9, 16, 17, 18  Handout #1 - 7