Calculate the wavelength of light, in nm, emitted from a mol of photons as they transition from the n=6 to n=3 in the hydrogen atom. Report four significant figures.

Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 6 state to the n = 2 state.

In Einstein's photoelectric experiment, the kinetic energy (K.E.) of an electron displaced from a metal by a photon was the difference between the energy of a photon and a threshold energy value for the metal. If you were to perform a similar experiment with lead, which has a threshold energy of 6.81 × 10⁻¹⁹ J, and ultraviolet light of wavelength 74.7 nm, what would be the speed (v) of the dislodged electron in meters per second? (K.E. = 1/2mv². The mass of the electron = 9.109 × 10⁻³¹ kg.)

An electron in an atom is known to be in a state with magnetic quantum number m₁ = −2. What is the smallest possible value of the principal quantum number n of the state? n = Ú X S