•WAVES–Amplitude and phase–Wavelength and Angular wave num

ber–Period T

–http://www.youtube.com/watch?v=9UKbBhKPxXQ

Amplitude and phase• Amplitude ym is a maximum

displacement of the element from their equilibrium position as waves pass through them.

• The phase changes linearly with time t. Means that sine function oscillate between +1 and –1.

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Wavelength and Angular wave number

• Wavelength is a distance between repeating unit of the wave shape.

• Consider at time t=0• y(x,0) = ym Sin (kx)

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Period

• Consider and oscillation at x=0 and time t. The displacement of the element of the string can be shown below

WAVES• 3 main types of waves…..

mechanical waves: most familiar. E g: water waves, sound waves, seismic waves

Electromagnetic wave: less familiar. E g : radio waves, visible light.

Matter waves: associated with electron, proton, and other fundamental

http://www.youtube.com/watch?v=4CtnUETLIFs&feature=related