WAVE;+classification,+identification+e+interactions.

Click on the next links. You will be redirected to a page with all you need to know about WAVES. Answer the questions, (use the blue arrows to go back if you need to review the concept). When you finish with that section use the green back arrow on the left hand corner to go back to this page and then click on the next link. Repeat the process every time. [|Wavelength and Wave Properties] [|Amplitude and Equilibrium] [|Frequency and Period]

W[|ave motion]

[|Wave diagram]

[|Practice here]

On the following link you will learn about seismic waves, which are the cause of earthquakes. You will have the opportunity to start an earthquake and understand how it works: [|Seismic waves - Do you understand Earthquakes?]

http://www.lexington1.net/technology/instruct/ppts/Science/Physical/Waves%20and%20Sound.ppt

**Check Your Understanding**
Consider the diagram below in order to answer questions #1-2.

1. The wavelength of the wave in the diagram above is given by letter __.

2. The amplitude of the wave in the diagram above is given by letter__ ___.

3. Indicate the interval which represents one full wavelength.

a. A to C b. B to D c. A to G d. C to G



We are most familiar with the Doppler effect because of our experiences with sound waves. Perhaps you recall an instance in which a police car or emergency vehicle was traveling towards you on the highway. As the car approached with its siren blasting, the [|pitch] of the siren sound (a measure of the siren's frequency) was high; and then suddenly after the car passed by, the [|pitch] of the siren sound was low. That was the Doppler effect - a shift in the apparent frequency for a sound wave produced by a moving source.

Electromagnetic waves are waves which have an electric and magnetic nature and are capable of traveling through a vacuum. Electromagnetic waves do not require a medium in order to transport their energy. Mechanical waves are waves which require a medium in order to transport their energy from one location to another. Because mechanical waves rely on particle interaction in order to transport their energy, they cannot travel through regions of space which are void of particles. That is, mechanical waves cannot travel through a vacuum. This feature of mechanical waves is often demonstrated in a Physics class. A ringing bell is placed in a jar and air inside the jar is evacuated. Once air is removed from the jar, the sound of the ringing bell can no longer be heard. The clapper is seen striking the bell; but the sound which it produces cannot be heard because there are no particles inside of the jar to transport the disturbance through the vacuum. Sound is a mechanical wave and cannot travel through a vacuum.

|| **# of Times** || [|More practice here] []
 * **Source** || **Intensity** || **Intensity**
 * Level**
 * Greater Than TOH**
 * Threshold of Hearing (TOH) || 1*10-12 W/m2 || 0 dB || 100 ||
 * Rustling Leaves || 1*10-11 W/m2 || 10 dB || 101 ||
 * Whisper || 1*10-10 W/m2 || 20 dB || 102 ||
 * Normal Conversation || 1*10-6 W/m2 || 60 dB || 106 ||
 * Busy Street Traffic || 1*10-5 W/m2 || 70 dB || 107 ||
 * Vacuum Cleaner || 1*10-4 W/m2 || 80 dB || 108 ||
 * Large Orchestra || 6.3*10-3 W/m2 || 98 dB || 109.8 ||
 * Walkman at Maximum Level || 1*10-2 W/m2 || 100 dB || 1010 ||
 * Front Rows of Rock Concert || 1*10-1 W/m2 || 110 dB || 1011 ||
 * Threshold of Pain || 1*101 W/m2 || 130 dB || 1013 ||
 * Military Jet Takeoff || 1*102 W/m2 || 140 dB || 1014 ||
 * Instant Perforation of Eardrum || 1*104 W/m2 || 160 dB || 1016 ||