Question

Calculate the energy of an electron that emits light at a wavelength of 5.00 x 10^-7m.

Answer 1

The energy of electron is 3.978×10⁻¹⁹ j.

Step-by-step explanation:

Given data:

Energy of electron = ?

Wavelength of electron = 5.00 ×10⁻⁷ m

Solution:

Formula:

E = hc/λ

E = energy

h = planck's constant (6.63×10⁻³⁴ j.s)

c = speed of light

λ = wavelength

Now we will put the values in formula.

E = 6.63×10⁻³⁴ j.s × 3×10⁸ m/s / 5.00 ×10⁻⁷ m

E = 19.89×10⁻²⁶ j.m /5.00 ×10⁻⁷ m

E = 3.978×10⁻¹⁹ j

The energy of electron is 3.978×10⁻¹⁹ j.