Homework Statement
Okay, I'll start off with a summary of the practical. And then the question.
The aim was to measure the wavelength of yellow light from a sodium vapour lamp, using a telescope and a diffraction grating of 300 lines per mm. The instructions tell us to prepare the apparatus, so...
This is a part of a homework question, and a concept that is expected to be understood. "Why do you think discharge tubes have a narrow waist?".
I was thinking about attempting the question like this:
Discharge tubes are mainly used to view spectra. And hence a thin tube, will allow a thin...