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# Amplitude

Amplitude. D istance measurement of the maximum displacement of a particle from the resting position (equilibrium) For a pendulum this is the angle or height that you lift the bob For sound this is interpreted by the loudness For light this is interpreted as the brightness. Crest and Trough.

## Amplitude

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### Presentation Transcript

1. Amplitude Distance measurement of the maximum displacement of a particle from the resting position (equilibrium) For a pendulum this is the angle or height that you lift the bob For sound this is interpreted by the loudness For light this is interpreted as the brightness

2. Crest and Trough The crest is the highest point of a wave The trough is the lowest point of a wave

3. Frequency The number of waves that occur in a certain amount of time These waves occur in the same amount of time (1 sec.) ~2.5 wave/sec ~4 wave/sec ~7.25 wave/sec

4. Interference • The result that occurs when 2 or more waves meet • Depending on how the crests or troughs meet up: • Constructive interference – waves meet and form one wave with a larger amplitude • Destructive interference – waves meet and partially or completely cancel out(than one of the waves) Constructive interference Destructive interference

5. Longitudinal Wave Compression Wave Particles of the wave move parallel to the direction of energy movement Ex: Sound wave, P-waves in earthquakes Click to see animation

6. Medium The matter through which the wave (energy) travels through, substance that carries the wave Can be a solid, liquid, or gas When the medium changes the speed (frequency)of the wave also changes Changing medium may cause wave to refract (bend) Air is the medium for sound waves Unless I am underwater, then water is the medium for sound waves

7. Oscillate - Oscillation Motions that repeat themselves Vibrations The oscillation of the vocal cords causes sound waves The oscillation of the hand causes a transverse wave in the slinky.

8. Pitch The perception of sound energy that describes tone Associated with the frequency of the sound wave High frequency = High pitch Low frequency = Low pitch

9. Reflection The interaction of a wave with a barrier (new medium) that causes the wave to bounce off the barrier and change directions A mirror can reflect light waves An echo is reflected sound waves

10. Refraction The bending of a wave path when traveling through a new medium This is how a rainbow is formed when light waves pass through a prism (or rain drop)

11. Transverse Wave Particles of the wave move perpendicular to the direction of energy movement Ex: Light waves, S-waves in earthquakes Click here for animation Particle movement (Energy)

12. Vacuum When an area contains no matter – no particles Empty space Absence of a medium

13. Wavelength • The measured distance of one complete wave • Crest to Crest • Trough to Trough • Resting point through crest and trough and back to resting position

14. Period The time it takes for one wave to pass a certain point Time it takes for one wavelength

15. Diffraction The spreading of a wave when it encounters a barrier with a small opening

16. Cycle One wave Wavelength is a distance measurement of one wave cycle

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