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2015 Q3 (Spectrometer experiment)
acc98 Leaving Cert Physics — 29/05/16 5

can someone PLEASE explain to me why in 2015 Q3 when calculating the wavelength of light in the marking scheme it says: when calculating d ( formula, d=1/n(lines per mm) ) it says to put d=1/80000, when in the question it says 'the diffraction grating had 80 lines per mm' should it not be 1/80??? as the formula is d=1/lines per mm.

Midleton — 15/05/16
You have to change it to lines per metre
jameslindsaypc — 18/05/16
You multiply 80 by 1000 just like converting mm to m to get 80000
Kevin baker — 18/05/16
Harish — 25/05/16
Change it to lines per metre. The SI unit of length is the metre
acc98 — 29/05/16
thanks guys, i have it written in my textbook wrong for some reason
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