In absorption spectrum . So , what happens here is that when white light is passed through a gas. The photons of the white light are absorbed by the electron in the gas. This means that the electron has received the required amount of energy from the white light needed for it to jump from the ground to excited state. Note : it can’t absorb every kind of light and leaves behind the one it didn’t absorb. Those ones which it didn’t absorb are formed on the screen or any board.

In emission spectrum , the electron jumps from higher to lower orbit. So , here energy is released by the electron . Here , we can see certain colors to be formed on the screen by the electron and some not. Here , what I don’t get is that what forces the electron to lose energy.

And would there be any difference if I used liquids and solids to be passed through white light.

This is wha I have tried to understand from these two phenomenon. Please help in correcting me where I am wrong.

In absorption spectrum . So , what happens here is that when white light is passed through a gas. The photons of the white light are absorbed by the electron in the gas. This means that the electron has received the required amount of energy from the white light needed for it to jump from the ground to excited state. 

Note : The gas can’t absorb every kind of light and leaves behind the one it didn’t absorb. Those ones which it didn’t absorb are formed on the screen.

In emission spectrum , the electron jumps from higher to lower orbit. So , here energy is released by the electron . Here , we can see certain colors to be formed on the screen by the electron and some not. My Q 1 here is that what forces the electron to lose energy?

Q2 would there be any difference if I used liquids and solids to be passed through white light?

This is what I have tried to understand from these two phenomenon. Please help in correcting me my Q’s and where I am wrong.