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I have the following MC question and I do not understand it at all. Can you please help me with this.

Determine which H atom transition (ninitial,nfinal) was responsible for the emission of a photon with a frequency of 6.17 x 1014 Hz.

[RH = 2.18 x 10-18 J; h = 6.63 x 10-34 J s ]

a. (2,3)

b. (2,4)

c. (5,2)

d. (4,2)

e. (3,2)

Also, Im stuck with this question:

A metal has a threshold wavelength, for the onset of the photoelectric effect, of 524 nm. What is the binding energy (in kJ/mol) of an electron to the metal surface?

Any help would be much appricieated

Thanks