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

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