JEE (Advanced) 2015 Paper-1 Question 2

Question 2

Consider a hydrogen atom with its electron in the $$n^{th}$$ orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc = 1242 eV nm)


Correct Answer: 2



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