3.3 Flashcards
define continuous spectrum
the colours white light is split into after going through a prism
how do you know the energy of an atom is quantized
only certain frequencies are released when sparked ect. so only certain energy levels for atoms
equation for energy levels of an atom
hv = E2 - E1
plancks constant x frequency = higher energy - lower energy
which energy transitions lead to the paschen series
n = 7,6,5,4 to n = 3
which energy transitions lead tot he Balmer series
n = 6,5,4,3 to n = 2
which transitions lead to the Lyman series
n = 5,4,3,2 to n = 1
Blamer’s frequency expression
v is proportional to 1/4 - 1/n^2
what is the Rydberg equation used for the lyman series
v = Rh[1/n1^2 - 1/n2^2] frequency = Rydberg constant [ 1/lower energy level squared - 1/higher energy level squared]
define ionisation energy
the minimum energy required to to completely remove the electron from the atom
when does the spectral lines for hydrogen converge into a continuum
at n = infinity
what sort of spectra emit electromagnetic waves
emission spectra
what sort of spectra absorb electromagnetic waves
absorption spectra
which photons are absorbed by absorption spectra
the ones with energy that corresponds to transitions between the ground state and excited state
what do absorption spectra look like
dark lines on a bright background
what does the bohr model of an atom suggest
electrons have specific orbits and a nucleus in the centre
emitting energy is electron moving between orbits
