The answer is 4.4143 x 10-19 joules
The energy (E) is: E = h f
h - Planck's constant
f - the frequency
The frequency (f) is: f = c/∧
c - the speed of light
∧ - the wavelength
Hence:
E = h f = h c / ∧
We know:
h = 6.626 x 10⁻³⁴ Js
c = 2.998 x 10⁸ m/s
∧ = 4.5 x 10⁻⁷ m
E = 6.626 x 10⁻³⁴ Js 2.998 x 10⁸ m/s / 4.5 x 10⁻⁷ m
E = 4.4143 x 10⁻³⁴ ⁺ ⁸ ⁻ ⁽⁻⁷⁾ J
E = 4.4143 x 10⁻¹⁹ J
