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A Hydrogen-like atom has atomic number ?...

A Hydrogen-like atom has atomic number ?. Photons emitted in the electronic transitions from level `n = 4` to level `n = 3` in these atoms are used to perform photoelectric effect experiment on a target metal. The maximum kinetic energy of the photoelectrons generated is `1. 95 eV`. If the photoelectric threshold wavelength for the target metal is `310 nm`, the value of ? is _______.
[Given: `hc = 1240 eV-nm and ?ℎ? = 13.6 eV`, where ? is the Rydberg constant, ℎ is the Planck’s constant and ? is the speed of light in vacuum]

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