According to the Bohr model of the atom electrons exist in orbits around the atomic nucleus labelled by a quantum number n. The Bohr radius of an Hydrogen atom is 0.53 angstroms. What is the radius for the n = 3 orbit ? Select one: a. 0.176 angstroms. b. 1.59 angstroms. c. 3.18 angstroms.

Which of these expressions would yield the wavelength of light in meters emitted when an electron drops from orbit n = 3 to n = 2 in a Bohr hydrogen atom? Given h = 4.14 x 10-15 eVs and c = 3.00 x 108 m/s.     a. 1.89/hxc   b. hc/1.89   c. 1.89 x h x c   d. (1.51 + 3.4)/hc   e. hc/3.4

If the Bohr radius of the n = 3 state of a hydrogen atom is R, then the radius of the ground state is A. 9R. B. 3R. C.R/3. D. R/9. Answer is D, please explain and write clearly.

An electron in an excited energy state of the Hydrogen atom has an energy En = 0.85 eV which is 12.75 eV above the ground state. What is the radius rn of the electron’s orbit? Select one: a. 4.77 angstroms b. 8.47 angstroms c. 13.23 angstroms d. 2.12 angstroms

Question A1 Give the term used in condensed matter physics for each of the following: a) The centre of the Brillouin zone b) A method for generating a neutron beam by bombarding a heavy metal target with protons c) The group of atoms associated with each lattice point in a crystal structure d) The Fourier transform of the lattice of a crystal e) A vibrational mode whose frequency tends to zero as the wavevector approaches zero f) A model of electronic structure in which electrons move in a weak, periodic potential and do not interact with each other by the Coulomb force

Relative to electrons and electron states, what does the I quantum number specify? Select one: a. The electron shell. b. The number of electron states in each electron subshell. c. The electron subshell. d. The number of electrons. e. The spin moment on each electron.

An electron is orbiting in the n = 3 orbit of an hydrogen atom. It is promoted by absorption of light energy to the n = 4 level. The Rydberg constant is R = 1.097 x 107 m-1. What is the wavelength of the light absorbed? Select one: a. 427 nm b. 1.094 μm c. 1.875 μm d. 763 nm

The Balmer series in hydrogen includes the Paschen series. has four lines in the ultraviolet. O includes both the Paschen series and the Lyman series. O has four lines in the visible. O includes the Lyman series.

When an excited hydrogen atom returns to the ground state light of wavelength λ = 102.5 nm is emitted. The Rydberg constant is R = 1.097 x 107 m-1. What was the principle quantum number n of the excited state? Select one: a. 3 b. 2 c. 5 d. 4