Exam 40: All About Atoms

Six electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by where n_x and n_y are integers. If a seventh electron is added to the system when it is in its ground state the least energy the additional electron can have is:

In a helium-neon laser, the laser light arises from a transition from a _________ state to a _________ state:

The most energetic electron in any atom at the end of a period of the periodic table is in:

Electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by where n_x and n_y are integers. At most the number of electrons that can have energy 8(h²/8mL²) is:

Radiation with the minimum wavelength as well as the K x-ray lines are detected for a certain target. The energy of the incident electrons is then doubled, with the result that:

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because:

The transition shown gives rise to an x-ray. The correct label for this is:

Five electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by where n_x and n_y are integers. In units of (h²/8mL²) the energy of the first excited state of the system is:

A magnetic dipole is placed between the poles of a magnet as shown. The direction of the associated force exerted on the dipole is:

Suppose the energy required to ionize an argon atom is i, the energy to excite it is e, and its thermal energy at room temperature is t. In increasing order, these three energies are:

A group of electromagnetic waves might Which of these describe the waves from a laser?

An electron in an atom is in a state with principal quantum number n = 4. The possible values of the orbital quantum number are:

The group of atoms at the beginning of periods of the periodic table are called:

Which of the following is essential for laser action to occur between two energy levels of an atom?

The number of states in a shell with principal quantum number n = 3 is:

An electron is in a quantum state for which there are seven allowed values of the z component of the angular momentum. The magnitude of the angular momentum is:

The number of states in a subshell with orbital quantum number is:

The possible values for the magnetic quantum number m_s of an electron in an atom:

In connection with x-ray emission the symbol K _$\alpha$ refers to:

For any atom other that hydrogen and helium all electrons in the same shell have: