Qualification > Sciences

P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE

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Chingoo:

--- Quote from: halosh92 on June 08, 2010, 12:34:37 pm ---one more question wat exactly is
diffraction
interference
path difference
phase differenec
the exact cie meaning plz

--- End quote ---
DIFFRACTION The spreading of waves about an obstacle or through a gap/aperture.
INTERFERENCE The superposition of waves which support each other at a point and cancel out each other's effect at another point.
The last two I'm not sure about.

halosh92:
what are the conditions for interfernce?

sabrina:

--- Quote from: halosh92 on June 08, 2010, 01:00:13 pm ---what are the conditions for interfernce?

--- End quote ---
1. should meet at a point
2. same type(means both should be either transverse or longitudinal)
3. same frequency, wavelength
4. if it is constructive interference so it should be in phase (path difference=lambda, phase difference=2pie)
5. if it is destructive interference so it should be out of phase (path difference=(2n+1)lambda/2, phase         difference=(2n+1)pie)
hope its clear

sabrina:
guys how to do o/n2008 q7bii

halosh92:

--- Quote from: sabrina on June 08, 2010, 01:08:07 pm ---1. should meet at a point
2. same type(means both should be either transverse or longitudinal)
3. same frequency, wavelength
4. if it is constructive interference so it should be in phase (path difference=lambda, phase difference=2pie)
5. if it is destructive interference so it should be out of phase (path difference=(2n+1)lambda/2, phase         difference=(2n+1)pie)
hope its clear


--- End quote ---

shouldnt we mention something about coherence??
and r u sure about the formulas isnt it for constructive:
path difference: n lamda

and destructive:
path difference= (n + 1/2) lambda and phase differnce = pie

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