Flashcards
Diffraction and Youngs Double Split
Cards in this deck (14)
- 1Define diffractionThe spreading out or bending of waves as they pass through a gap or around an obstacle
- 2Which type of waves can diffract?All types
- 3What does the amount of diffraction depend on?The ratio of the wavelength to the size of the opening or obstacle
- 4When is diffraction the greatest?When the wavelength is approximately the same size as the width of the gap
- 5Young double split experiment diagram:
- 6Through the double split, what colour of light is shown?Red (as longest wavelength at the top and bottom of original diffracted light waves)
- 7What do we see a bright and dark pattern on the screen?It's the result of destructive interference
- 8What do we call the bright parts of the pattern?Bright fringes
- 9What do we call the dark parts of the pattern?Dark fringes
- 10What is the central fringe?The brightest which then reduces the further away from the centre you go
- 11The bright and dark fringes create a pattern which is.....Symmetrical
- 12If in a question that just says "fringes" (and not bright or dark) , what should we assume?It's talking about bright fringes
- 13What is the equation for fringe spacing?Fringe spacing (m) = (wavelength (m) x distance from slits to screen (m) ) / slit spacing (m)
w = λD / s - 14The fringe spacing is measured between either the......Bright spots or the dark spots