Examples for atomic physics
True or False:
a.) An electron in the ground state of a Hydrogen atom has zero orbital angular momentum.
b.) An electron in the ground state of a Hydrogen atom has zero spin angular momentum.
c.) An electron in the ground state of a Hydrogen atom has zero kinetic energy.
d.) An electron in the ground state of a Hydrogen atom has zero probability of being at the origin.
e.) An electron in the n=2 level of Hydrogen will emit visible light when it decays to the ground state.
a.) What is the energy of a photon emitted as an electron moves from the n = 5 to the n = 2 level in hydrogen?
The energy of each level goes as (13.6 eV)/n2. The difference between the n = 5 and n = 2 values is the photon's energy.
b.) What is the wavelength of such a photon?
Change the energy to Joules, then use E = hf to get the frequency. Then get the wavelength. OR use the formula:
c.) What is the energy of a photon in the same transition is carbon (Z=6)?
The energy scales as Z2, so multiply the answer in part a by 36.
a.) How many electrons are in an atom specified by 1s2,2s2,2p6,3s2,3p4?
Count up the numbers in the superscripts.
b.) Write the spectroscopic notation for a neutral gold (Au) atom?
See that a gold atom should have 79 electrons by looking at the periodic table. Then count up:
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