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Photon energy E is given by ...

E = hf

Frequency, f, is given by the wave equation v.=.fl as....

f = v/l

At once, the energy of photons for radiation of wavelength l, is given by....

E = vh/l

The photon energy of light of green light, wavelength 5.00x10^-7 m is....

3.00x10⁸ x 6.63x10^-34 / (5.00x10^-7)

= 4.0x10^{(8 - 34 +7)}

= 4.0x10^-19 Joules

... which is ... 4.0x10^-19 / (1.6x10^-19)

= 2.5 eV