Question

Calculate the wavelength of photon having energy 5 e.V.​

Answer 1

Answer: 3.972 × 10⁻²⁶m

Using the formula : eV = hf

Where eV is the energy of the photon

h = planks constant = 6.62 × 10⁻³⁴

f = frequency

f = C / Y

C = Speed of light = 3.0 × 10⁸m/s

Y = Wavelength

Substituting in the formula :

5 =( 6.62 × 10⁻³⁴ × 3 ×10⁸) / Y

Y = (6.62 × 10⁻³⁴ × 3 × 10⁸) / 5 = 3.972 × 10⁻²⁶m