λ=h/p
The same formula gives the momentum of a photon or wavelength λ.
p=mv
ΔE = hc/λ = -13.59 eV * ([1/n(f)^2] - [1/n(i)^2]); 2nd eqn. used to determine the transitions between the energy levels of the hydrogen atom as defined by their principle quantum numbers n(f) and n(i)
h = 6.626 x 10^-34 J-s
c = 2.998 × 10^8 m/s
any energy state higher than the ground state (n = 2, 3, ....)
E = (-hcR(∞)) x (1/n^2), where -hcR(∞) = -2.18 x 10^-18 and n = principle quantum number
ΔE = hc/λ = -13.59 eV * ([1/n(f)^2] - [1/n(i)^2]); 2nd eqn. used to determine the transitions between the energy levels of the hydrogen atom as defined by their principle quantum numbers n(f) and n(i)