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Progressive Waves

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Information about Progressive Waves

Published on March 24, 2009

Author: christaines

Source: slideshare.net

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Progressive waves

“ Looking out into the immensity of the universe, we stand at the shores of the cosmic ocean. Yet our earthly seas are no less beautiful, and the crashing surf reminds us that most of what we know about our world comes from information carried by waves.” Carl Sagan

“ Looking out into the immensity of the universe, we stand at the shores of the cosmic ocean. Yet our earthly seas are no less beautiful, and the crashing surf reminds us that most of what we know about our world comes from information carried by waves.”

Carl Sagan

Waves A basic concept of physics Progressive waves Describing waves Longitudinal Transverse

A basic concept of physics

Progressive waves

Describing waves

Longitudinal

Transverse

Graphical representation Displacement - time graph Transverse mechanical wave Longitudinal wave Amplitude Wavelength Frequency

Displacement - time graph

Transverse mechanical wave

Longitudinal wave

Amplitude

Wavelength

Frequency

 

Wavelength, frequency and wave speed A wave source vibrates at f vibrations per second  particles of transmitting medium vibrate at same frequency 1 complete vibration = 1 wave generated  disturbance =  m from source   = f  or c = f  Note: this is not on data sheet

A wave source vibrates at f vibrations per second  particles of transmitting medium vibrate at same frequency

1 complete vibration = 1 wave generated

 disturbance =  m from source

  = f  or c = f 

Note: this is not on data sheet

Phase

A and B: in phase B and C: in antiphase Phase difference  Calculating  for x 1 and x 2  = 2  ( x 1 - x 2 )  If x 1 - x 2 integer number  s,  = 2  , 4  , 6  etc

A and B: in phase

B and C: in antiphase

Phase difference 

Calculating  for x 1 and x 2

 = 2  ( x 1 - x 2 )



If x 1 - x 2 integer number  s,  = 2  , 4  , 6  etc

Path difference

Waves emitted from a and B in phase At P: relative phase depends on distance travelled Path difference = BP – AP Path difference = n   constructive Path difference = (n + ½ )   destructive

Waves emitted from a and B in phase

At P: relative phase depends on distance travelled

Path difference = BP – AP

Path difference = n   constructive

Path difference = (n + ½ )   destructive

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