1.
Explain: why do fluorescence materials produce continuous spectra while excited gases produce
line-spectra?
Solution
continuous spectra:
in a continuous spectra all wavelengths are present
it is happend by fluorescence materials.
it is formed by collecting all frequencies travelling through space together.
continuos spectra usually corresponds to the thermal radiation
line spectra:
it is formed by collecting light emmited from exiceted atoms whose electrons are falling back
down to the lower energy states. electron transitions can only happen at the discrete energies by
the laws of quantum mechanics.
in the line spectra wavelengths between two lines are absent.