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A photon emitted in a Bohr-model transition between levels n_i and n_f has frequency given by:

Ahν = E_n_i E_n_f
Bhν = E_n_i + E_n_f
Chν = |E_n_i − E_n_f|
Dν = h/(E_n_i − E_n_f)
Answer & Solution
Correct answer: C. hν = |E_n_i − E_n_f|
Bohr's frequency condition: hν = |ΔE|.
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