A hydrogen atom emits a photon which consists of momentum 0.3407 × 10-27 kg•m/s. This photon is emitted as the electron in the atom falls from the higher energy level into the n = 4 level. Find out the quantum number of the level from which the electron falls? Employ values of h = 6.626 x 10-34 J•s, c = 2.998 x 108 m/s and e = 1.602 x 10-19 C.