Progressive Waves
-
Upload
chris-staines -
Category
Education
-
view
6.909 -
download
1
description
Transcript of Progressive Waves
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
Waves
• A basic concept of physics
• Progressive waves
• Describing waves
• Longitudinal
• Transverse
Graphical representation
• Displacement - time graph
• Transverse mechanical wave
• Longitudinal wave
• Amplitude
• Wavelength
• Frequency
Wavelength, frequency and wave speed
• A wave source vibrates at f vibrations per secondparticles 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 x1 and x2
= 2 (x1- x2)
• If x1- x2 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