Why emission spectra are seen in only those gases which have low density or low number of collisions?

Asked by rsrakesh932 | 12th Jun, 2020, 04:38: PM

Expert Answer:

In thin gases, atoms do not experience less collisions due to their low densities. The emission lines corresponds to photons of discrete energies which are emitted when excited atomic states in the gass make transitions from higher to lower energy levels. Thus, the emission spectra are produced by thin gases having low densities and low collisions. 

Answered by Shiwani Sawant | 13th Jun, 2020, 05:00: PM