Question

If photon energy is near about 3.5 eV, then it causes the sunburn i.e. to break the bond in molecules of human skin. This corresponds to the wavelength in the​

Answer 1

Given info : If photon energy is near about 3.5 eV, then it causes the sunburn i.e. to break the bond in molecules of human skin.

To find : This corresponds to the wavelength in the ..

solution : energy of photon, E = 3.5 eV = 3.5 × 1.6 × 10^-19 J

= 5.6 × 10^-19 J

we know, energy of photon is given by, E = hc/λ

∴ λ = hc/E = (6.63 × 10^-34 Js × 3 × 10^8 m/s)/(5.6 × 10^-19 J)

= 3.5518 × 10^-7 m

= 355.18 × 10^-9 m

= 355.18 nm

we know, The range of ultraviolet rays is 100 - 400 nm. and it is obvious that 355.18 nm lies between 100 - 400 nm.

Therefore the corresponds wavelength in the region of ultraviolet rays.