Answer :
- Frequency=v=2×10^15Hz
- Energy=E
Using planks quantum theory
[tex]\\ \sf\longmapsto E=hv[/tex]
[tex]\\ \sf\longmapsto E=6.626\times 10^{-34}Js\times 2\times 10^{15}s^{-1}[/tex]
[tex]\\ \sf\longmapsto E=13.252\times 10^{-19}J[/tex]
[tex]\\ \sf\longmapsto E=1.3\times 10^{-18}J[/tex]