superposition Flashcards
principle of superposition
when 2 or more waves meet at a point then the resultant displacement is equal to the vector sum of displacement of individual waves.
diffraction
the spreading of a wave when it passes thru a gape or past the edge of an edge.
interference
the superposition of 2or more waves from coherent sources
coherent
term to describe 2 waves emitted from 2 sources that have a constant phase difference.
coherent source
2 sources with the exactly same frequency and have 0 or constant phase difference
the equation for young’s modulus
lamda equals (a x) divided by D
equa for diffraction grating
d sin(Q) equals to n lamda
the advantages of diffraction grating over double slit
the maximimas are sharp, bright. in DS the maxs are too close to be entirly precise but in DG there is large seperation and measuring of angles.
path difference for constructive interference
whole number n into lamda
path difference for destructive interference
whole number n plus half lamda
how do we prove that the ray of monochromatic light is reaching the screen is from the 2 slits
cover one slit, the maximas are replaced with broad band of light dispersion from the other slit. repeat for the other slit same shit happens.
the relationship between separation between maxima’s (x) and separation between slit (a)
x inverse to a
the relationship between and separation between screen and slit (D) separation between slit (a)
a is proportional to d
conditions for superposition or interference
1.same type of wave
2must meet at a point
3 same direction of polarization
4 must be coherent
when should sth be in phase
path diff is whole num and phase diff is even
