Spectra Flashcards
what is lowest energy level called
ground state
what is it called when an electron moves higher
excited state
how does an electron move higher
absorbs energy in form of photon
how does an electron get rid of its energy
releasing a photon
equation to work out frequency of emitted photon
f= change in E / h
how to work out change in energy
where you start - where you end
emission spectrum
lines of colour in a continuous spectrum associated with a particular electron transition between two energy levels in an atom
absorption spectrum
black lines in a continuous spectrum caused when the vapour of an element absorbs particular photons of light.
The photons absorbed have exactly the same energy as energy gaps in the energy level within the atom of the element.
Bohr model of the atom
central positive nucleus and electrons in definite energy levels surrounding the nucleus
what is an energy level
an electron orbit in the Bohr atom
ionisation energy
the energy level at which an electron escapes from the electric field of the nucleus
what does the sun emit?
all visible wavelengths of light
what does the gas in the sun’s upper atmosphere do?
absorbs photons of these wavelengths
fraunhofer lines
dark lines of the sun’s absorption spectrum which can be used to identify elements present in the sun’s outer atmosphere.
named after the German physicist who identified them
