Question

calculate energy of photon of wavelength 400nm...​

Answer 1

$\huge\fbox\pink{A}\fbox\red{N}\fbox\green{S}\fbox\blue{W}\fbox\purple{E}\fbox\blue{R}$

What is the energy of a single photon (in eV) from a light source with a wavelength of 400 nm? Solution: Use E = pc = hc/l. This gives an answer in Joules, then multiply by 1.6E-19 to get answer in eV.

Hope my answer will be helpful for you dear :)