prelab for Physics 1251 lab \"Spectroscopy\" The spectrometer has an angle scale

Question

prelab for Physics 1251 lab "Spectroscopy"

The spectrometer has an angle scale that nominally reads 180° when the light goes straight through. That is, 180° should correspond to straight through but doesn't always exactly line up. If you move 10° in either direction you should get 170° and 190°. If you spot the same line in each direction and your measurements are 159.1° and 195.7°, What is the angle you should use for the interference fringe in the equation d sin = ? Your answer must be to the nearest tenth of a degree.

You measure an angle of 19.3 when the light passes through a grating with 790 lines per mm. What is the wavelength of the light?

Which of the following are "allowed" transitions?

4p-3s'

2s-4p

3p'-3d'

5p-6p

4s-5d

Explanation / Answer

b)

here by using the formula

n(lambda) = d * sin(theta)

1 * lambda = (1 / 790000) * sin(19.3 deg)

lambda = 418 nm

the wavelength of the light 418 nm

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