How do I find the energy in joules given the wavelength?
Use Planck's equation E = h x c / λ and substitute the values of the wavelength (λ), Planck's constant in joules (h = 6.6261 × 10⁻³⁴ J⋅s), and speed of light (c = 299792458 m/s).
With these units, you'll get an energy result in joules (J).
That's it!