Map Sapling Learning Consider a hydrogen atom in the ground state. What is the energy of its electron? Number 2.18 x 10 18 Now consider an excited-state hydrogen atom. What is the energy of the electron in the n 3 level? Number 7.26 x 10 19 J Previous Give Up & View solution Check Answer 0 Next 2 Exi O Hint
where B = 2.18 x 10-18 J and Z = charge onnucleus (number of protons).
2. Anelectron in the 4th energy level of the H atom drops tothe 1st energy level. In other words an excited electrondrops to the ground state. What is the energy (in J) of the emittedphoton)? The energy of an electron in the nth level is
En =
-
Bn2
=
-
2.18 x 10-18 Jn2
3.The photoelectric effect for a certain alloy has a thresholdfrequency of 8.40 x 1014 Hz. For light of thisfrequency, find the energy of one mole of photons (inkJ).