Question

There is emittion of electrons when electomagnetic wave fall on a

Answer 1

$\huge\red{Answer}$

The nucleus of an atom is surrounded by electrons. These are arranged energy levels at different distances from the nucleus:

the lowest energy level is closest to the nucleus

electrons usually occupy the lowest energy levels available to them

The arrangement of electrons differs from element to element, and is responsible for the chemical properties of each element. However, the arrangements may change when electromagnetic radiation is absorbed or emitted.

Exciting electrons

An inner electron in a low energy level can rise to a higher energy level. We say that it becomes ‘excited’. An electron can be excited when its absorbs energy from electromagnetic radiation.

Different changes in energy level need different frequencies of electromagnetic radiation. The absorption of radiation can be analysed by an ‘absorption spectrum’. The different black lines show the frequencies absorbed by electrons in atoms.

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