Question

calculate the energy of wavelength 0.50​

Answer 1

Energy (E) of a photon having wavelength (λ) is given by the expression,

where , h = Planck’s constant = 6.626 × 10–34 Js

c = velocity of light in vacuum = 3 × 108 m/s

Substituting the values in the given expression of E:

Answer 2

The energy of a photon with wavelength 0.5 A⁰ will be 3.97 x 10⁻¹⁵ Joules

Explanation :

According to planks quantum theory Energy of a photon is given by,

E = hc/λ

where h = planks constant = 6.626 x 10⁻³⁴ Js

c = speed of light = 3 x 10⁸ m/s

λ = wavelength = 0.5 A⁰ = 0.5 x 10⁻¹⁰ m

Hence,

E = (6.626 x 10⁻³⁴ x 3 x 10⁸ )/0.5 x 10⁻¹⁰

= 3.97 x 10⁻¹⁵ Joules

Hence the energy of a photon with wavelength 0.5 A⁰ will be 3.97 x 10⁻¹⁵ Joules