Question

Names: (1 pt) Angle Reading for Center Max (pink line): (5 pts) Spectral lines Reading on Spectrometer (degrees) Line Color Violet (faint) 6 21 8 (optional!) m-2 m=1 42 Violet (brighter) m2 m 1 Green 4 239 4 3.7 m2 m-1 Red 3 101.4 6フレ SAO 10 S 3 52 (1 pts) Rating of the diffraction grating (in lines/mm): (5 pts) Using either Equation 1 or 2, find the theoretical wavelengths of the spectral lines for n 3,4, (n-6 if you were able). Analysis er

Answer 1

we shall use this formula:

mλ sin θη

where d is the spacing of the diffraction grating

we are given the rating to be 540 lines per mm

therefore the distance between two grating lines (d) is

1.85 x 10 mm = 1.85 x 106 d = 540

therefore we have

dsintn (1) m.

so, For n = 3

we have

1.85 x 106-6 x sin35.5 Ared 1066 nm

for n = 4

1.85 x 10 x sin239.4 793 nm Agreen