Back to the atom Flashcards
When does atomic spectra arise?
When atoms interact with EM radiation.
What did Balmer notice?
That emission frequencies observed in the visible region of the EM spectrum followed a pattern according to the Balmer equation. v = constant(1/4 - 1/n^2)
What is the series called when n1=1?
Lyman
What is the series called when n1=3?
Paschen
What is the series called when n1=4?
Brackett
What is the difference between an emission and absorption spectra?
An emission spectrum contains coloured lines on a dark background whereas an absorption spectrum contains dark lines on a coloured background.
How is an absorption spectrum formed?
When energy is absorbed from the EM radiation continuum to promote an electron from the lowest energy state to a higher energy state.
What is the formula de Broglie came up with that relates matter to its wave?
lambda = h/mv
What is 1 joule equivalent to in terms of kg, m and s?
1kgm^2s^-2
What was de Broglie’s version of the atom?
The idea that each electron orbit was considered to be a fixed number times the wavelength.
Why can the wave behaviour of electrons not be ignored?
As they are small and their wave-like behaviour is significant when in comparison to larger objects.
What is the Heisenberg Uncertainty principle?
The idea that when objects exhibit wave-like properties their position and momentum cannot be measured at the same time as in order to measure either property the other property must be changed in the experiment.
What was the lower limit to this uncertainty?
h/4pi. Can be expresses as deltapxdeltaq is greater than or equal to h/4pi.
How does the uncertainty vary with mass?
Uncertainty increases with decreasing mass.
What is the Rydberg equation?
Frequency = Rh(1/n1^2 - 1/n2^2)
