Question

If you increase the voltage in a spectral lamp, you notice a change in the discrete spectrum. Why?

I assume that what I wrote below might be the answer, but I'm not sure ... Can you check? Thanks!

If you increase the voltage, electrons will leave the cathode at a faster speed, causing higher speed collisions with the atoms of the gas in the spectral lamp.

Therefore it might cause that electrons of the gas atoms get excited more and might even reach higher energy bands than they could before the voltage increase.

When falling back to lower energy levels, this might cause emission of photons with lower wave lengths (higher frequencies) than before, causing more spectral lines becoming visible.

And probably also a little less light of the already existing higher wave lengths will appear.

Is this Correct?

Answer 1

Correct

If you increase the voltage, electrons will leave the cathod accelerate to high speed, causing higher speed collisions with the atoms of the gas in the spectral lamp.

Therfore it might cause that electrons of the gas atoms get excited more and might even reach higher energy bands than they could before the voltage increase. When an electron hit by a photon of light, it absorbs the quanta of energy the photon was carrying and moves to a higher energy state.

When falling back to lower energy levels, this might cause emission of photons with lower wave length than before, causing more spectral lines becoming visible.And probably also a little less light of the already existing higher wave lengths will appear.