To calculate the wavelength from energy in electron volts (eV), you can use the following formula that relates energy (E) and wavelength (λ) for photons:
λ = (hc) / E
Where: λ = Wavelength of the photon (in meters, m) h = Planck's constant (approximately 6.62607015 × 10^-34 joule-seconds, J·s) c = Speed of light in a vacuum (approximately 299,792,458 meters per second, m/s) E = Energy of the photon (in electron volts, eV)
In this formula, the energy should be converted to joules (J) before applying the equation, since Planck's constant and the speed of light are given in SI units.
To convert energy from electron volts (eV) to joules (J), you can use the conversion factor:
1 eV = 1.602176634 × 10^-19 J
So, if you have the energy in eV, you would divide it by the conversion factor to obtain the energy in joules (J). Then you can use the formula above to calculate the wavelength.