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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

welll

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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