17172303
| Question | Answer |
| With diffraction gratings, we refer to fringes as.... | Maxima |
| What is the difference between the patterns produced by diffraction grating and the patterns produced by a double slit? | The maxima are much sharper (actual pattern is same) |
| The slit separation on diffraction gratings compared to double slits is usually much.... | Smaller , therefore maxima separation is much larger |
| How would we calculate the slit separation in metres (symbol d) | Lets use the value of 300 lines per mm Multiply this by 1000 to get in metres Do 1/answer for slit seperation (300mm = 300000m , 1/300000 = 3.3x10^-6m) |
| Diffraction grating formula : | dsinθ = nλ (d = slit separation) (θ = angle between maximum and n=0 line) (n = order of maximum) (λ = wavelegth) |
| Diffraction grating diagram: | |
| Maxima separation (top = monochromatic light , bottom = white light) : |
Image:
415slits (image/jpeg)
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