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The frequency  of the photon is 5.12  x10 ^15  Hz

  calculation

frequency in photons =  energy / planck's  constant

Energy = 3.4 x10^-18  joules

planck's  constant = 6.63 x0 ^-34 j.s

frequency is therefore=  3.4 x10^-18 j  / 6.63 x10^34 j.s  = 5.12 x10^ 15 Sec

  convert sec into Hz

That is   1 sec  = 1 HZ

therefore 5.12 x10^15 sec  = 5.12 x10 ^15  HZ