hydrogen gei spectrum 點解會係discerete line

1)it is because the energy in the atom is quantized.<--最重要
2)when energy is given to hydrogen atom..the electron will be excited from low energy level to high energy level.
3)since the excited electron is unstable,so it will "fall back"from high energy level to low energy level
4)The energy will be re-emitted as EM wave..which is a definite amount of energy..
5)so we look at the spectrum,we can find that there are numerial discrete lines..it is because the electrons fall back from 1 definite higher energy level to 1 definite lower level respectively and intermediate of 2 levels wont allow the electron to stay,thats why during the process,only photon will be emitted which is a definite amount of energy instead of continuous amount of energy<--最重要

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