# line and continuous spectrum

why line spectrum is derived from gas at low pressure ?

why the continuous spectrum is emitted by excited atoms in solid or gas at high pressre ?

### 2 個解答

• 天同
Lv 7
1 十年前
最愛解答

No, the above answers are really NOT correct.

Pressure exhibited by a gas is due to the change of momentum of gas molecules when they bombard a surface. It is entirely unelated to the energy level of orbital electrons.

Transistion of orbital electrons from a higher orbit (energy level) to a lower orbit (lower energy level) emits electromagnetic waves. If the wavelength of the wave emitted is within the visible spectrum, then spectral lines are observed. A collection of these spectral lines constitutes a 'line spectrum'.

On the other hand, atoms in solids are closely packed, electron orbits of the atoms are overlapping with one another, thus forming a continuous energy level (i.e. a band of energy). Transistion of electrons can happen at any level with the energy band, thus producing a continuous spectrum.

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• majou
Lv 5
1 十年前

錯解了。多謝樓下指正。

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