Original post by Ninja1235
a diffraction grating has 900 lines per mm-1, how do I calculate the slit spacing?
using d=1/Number of slits? The mark scheme says the answer is 1.1*10-6 metres but Im not getting that answer when I try it.
using d=1/Number of slits? The mark scheme says the answer is 1.1*10-6 metres but Im not getting that answer when I try it.
Are you getting 1.111111...*10^-6?
Also it's a trap - the lines have been given per mm, whereas the answer is in metres - that may be catching you out.
Original post by Ninja1235
a diffraction grating has 900 lines per mm-1, how do I calculate the slit spacing?
using d=1/Number of slits? The mark scheme says the answer is 1.1*10-6 metres but Im not getting that answer when I try it.
using d=1/Number of slits? The mark scheme says the answer is 1.1*10-6 metres but Im not getting that answer when I try it.
If it's in mm-1, multiply the number of slits by 1,000. Hence m.
(edited 6 years ago)
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