Question

The energy of light of wavelength 45nm is

Answer 1

Energy of light wavelength= planks constant × frequency

which can also be written as

Energy = Plank's constant ×( speed of light )/ wavelength of light
thus....

$energy = 6.626 \times {10}^{ - 34} \times 3 \times {10}^{8} \div 45 \times {10}^{ -9}$
thus...
E= 0.441733 × 10^-17 Joules....

hope it helps you......
:)....