p2:waves - Slits

Question 1

what happens when waves pass 2 slits

Answer 1

they spreadout and intefere with each other forming an interference pattern

Question 2

how do you work out constructive intefrence in double slits

Answer 2

dsin() = n x wavlength

Question 3

how do you work out destructive interference in double slits

Answer 3

dsin() = (n + 1/2)xwavelength

Question 4

when can constructive interference only work

Answer 4

when distance between slits is smaller than the distance bewtween the slits and the screen

Question 5

what is youngs double slit equation

Answer 5

fringe spacing(w) = wavelength x distance from slit to screen(D) / slit separation(s)

Question 6

what doesnt affect the finge spacing

Answer 6

width of slits

Question 7

how do we work out the distance between slits

Answer 7

1/ how many lines there are

Question 8

what are the uses of diffraction gratings(3 things)

Answer 8

used in cd and dvd players
splits white light into a spectrum(useful when looking intoatomic spectrum)
astronomy

Question 9

what is huygens principle

Answer 9

every wavefront is made up of wavelets
each wavelets interact with each other and generate weave fronts

Question 10

in single slit diffraction which point is constructive interference

Answer 10

n = 0 (central fringe)

Question 11

what is the centeral fring compared to the tothers

Answer 11

twice as wide