The energy of photon of electromagnetic radiation of wavelength = $2000\: A^{\circ}$ is:

Question

$\begin {array} {1 1} (a)\;1.76 \times 10^{-18}J & \quad (b)\; 0.99 \times 10^{-18} J \\ (c)\;0.54 \times 10^{-18}J & \quad (d)\;0.63 \times 10^{-18}J \end {array}$