Answer
$\nu = 1.1*10^{-15} s^{-1}$
$E=7.4*10^{-19}J$
Work Step by Step
Energy is given by:
$E = \frac{hc}{ \lambda}$
$E = \frac{6.625*10^{-34}*3*10^8}{ 270*10^{-9}}$
$E=7.4*10^{-19}J$
Frequency is given by:
$ \lambda = \frac{c}{ \nu}$
Substituting gives:
$1.1*10^{-15} s^{-1}$
