Teaching Modern Physics - QuarkNet - Fermilab

Modern Physics
Bohr Theory Problems
1. How do Bohr’s assumptions contradict classical physics?
2a. What is the energy of the photon that could cause an electron’s transition from the n = 4 state
to the n = 5 state of hydrogen?
b. What energy would be released by an electron making the transition from the n = 5 state
to the n = 4 state?
3a. Calculate the radii of the first, second and third Bohr orbits of hydrogen.
b. Calculate the radius of the first Bohr orbit in b: He + , Li 2+ , and Be 3+
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