Is light being emitted or absorbed?

[J-Girl]

is light being emitted or absorbed??

How do I know if light is being absorbed or emitted? I had to find the energy and wavelength of the following transitions, for the first two i ended up with positive numbers, for the last two I ended up with positive numbers
1.1-->2
2.3--4
3.5-->1
4.4-->1

 

[PeterO]

How do I know if light is being absorbed or emitted? I had to find the energy and wavelength of the following transitions, for the first two i ended up with positive numbers, for the last two I ended up with positive numbers
1.1-->2
2.3--4
3.5-->1
4.4-->1

Level 1 usually refers to ground state, so energy is absorbed going to a higher number, and emitted when changing to a lower number level.

 

[J-Girl]

thankyou:) my textbook didnt tell me that unfortunately