If ${\left[Cu{\left(H_{2}O\right)}_4\right]}^{2+}$ absorbs a light of wave length 600 nm for d-d transition, then the value of octahedral crystal field splitting energy for ${\left[Cu{\left(H_{2}O\right)}_6\right]}^{2+}$ will be____$\times {10}^{-21}J$ [Nearest integer]
$(Given:h=6.63\times {10}^{-34}Js andC=3.08\times {10}^{8}m{s}^{-1})$