Section2 :Wave Properties Wave: disturbance that carries energy

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Presentation transcript:

Section2 :Wave Properties Wave: disturbance that carries energy

Mechanical Waves: Wave that carries energy through a material (medium)-air,water,metal Types of waves: Pulse Wave: A single disturbance or wave Continuous Wave / periodic wave: A group of pulse waves or a bunch of waves

Transverse wave: Particle move up and down Examples:

Longitudinal or Compression Wave: Particles move back and forth Examples:

Surface Waves: Examples: http://www.gmi.edu/~drussell/Demos/waves/wavemotion.html Surface Waves: Examples:

Earth Quakes S-Wave: Transverse wave P-Wave: Compression wave

Parts of Waves:

Wave Speed: Speed of the wave. ** Does not change in a medium**  =    - Wave speed (m/s) or - Frequency (Hz) =  /T T – Period (sec) - Wave length (m) EX-1 ) Calculate the frequency and period of wave speed for the following situation.

EX-2) A piano emits a frequency that ranges from a low of about 28 Hz to a high of about 4200 Hz. Find the range of wavelengths in air from this instrument when the speed of sound in air is 340 m/s.

Wave Interference Waves at boundaries: Incident wave – Wave approaching boundary Reflected wave – Wave after reflection Loose end Fixed end

Principle of Superposition: When two wave interact, the resultant wave is the sum of the two.

Constructive Interference:

Destructive Interference:

Standing Waves: happen when two waves of the same frequency and amplitude oppose each other and cause interference. Node: Nodes: Regions of destructive interference Anti Nodes: Regions of constructive interference.

Beats: Two wave that are very close in frequency causing distinctive collective regions of interference

Interference Patterns: Patterns created when the waves on 2 or more sources create repetitive regions of constructive and destructive interference