λ = wavelenght = 112.81 nm= 1.12 x 10^-7 m
v= speed of light = 299,792,458 m/s
Find frequency :
f = v / λ = 299,792,458/ 1.12 x 10^-7 = 2.68 x 10 ^15 s
Apply :
E = h x f
where:
h= constant = 6.63 x 10 ^-34 HZ
f = frequency
E = 6.63 x 10 ^-34 x 2.68 x 10 ^15 = 1.77 x 10^-18 J