12.1 Two Types of Waves:A transverse wave has its oscillations perpendicular to the direction the wave moves.A longitudinal wave has its oscillations in the same direction as the wave moves.
Longitudinal WaveThe wave we see here is a longitudinal wave.The medium particles vibrate parallel to the motion of the pulse.This is the same type of wave that we use to transfer sound. show tuning fork demo 4
Transverse WavesThe difference between the two types: 5
Wave InteractionAll we have left to discover is how waves interact with each other.*When two waves meet while traveling along the same medium it is called INTERFERENCE. 21
Constructive InterferenceLet’s consider two waves moving towards each other, both having a positive upward amplitude.What will happen when they meet? 22
*Constructive Interference*They will ADD together to produce a greater amplitude.This is known as CONSTRUCTIVE INTERFERENCE. 23
Destructive InterferenceNow let’s consider the opposite, two waves moving towards each other, one having a positive (upward) and one a negative (downward) amplitude.What will happen when they meet? 24
*Destructive Interference*This time when they add together they will produce a smaller amplitude.This is know as DESTRUCTIVE INTERFERENCE. 25
Check Your Understanding Which points will produce constructive interference and which will produce destructive interference? Constructive G, J, M, N Destructive H, I, K, L, O 27
Your Turn: Create a graphic organizer using the following terms:1. Reflection2. Refraction3. Diffraction4. Absorption Explain what the term means. (use your own words) Draw a picture to represent what happens. List Examples
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