Calculate the energy in corresponding to light of wavelength 45nm.

Answer:

λ = 45 nm = 45 x 10^-9 m

We need to find

We need to calculate the energy for the given wavelength

We know that

E = hc/λ———-(i)

where

• h = Planck’s constant= 6.62607015×10⁻³⁴ Js
• c = velocity of light= 3 × 10⁸ m/s

Solution

Substituting the known values in equation (i) we get

E= 6.62607015×10⁻³⁴ X 3 × 10⁸ / 45 x 10^-9

E= 4.42 × 10⁻¹⁸ Joules

Hence energy for the given wavelength is 4.42 × 10⁻¹⁸ Joules

Articles to Explore:

1. In vacuum, the speed of light depends upon (a) frequency (b) wavelength (c) velocity of light sources (d) None of these
2. The sky appears dark to passengers flying at very high altitudes mainly because (a) Scattering of light is not enough at such heights. (b) There is no atmosphere at great heights. (c) The size of molecules is smaller than the wavelength of visible light. (d) The light gets scattered towards the earth.