Exam 38: Atomic Physics

Positronium consists of a bound state of an electron and a positron.A positron is exactly the same as an electron,except it has a charge of +e instead of -e.In the classical model,both particles orbit a point midway between them.The reduced mass of positronium is equal to

What are the quantum numbers n and l for a hydrogen atom with E = - (13.6/16)eV and L = $\sqrt6$ ?

How many electrons are allowed to inhabit the M-shell of an atom?

A hydrogen atom relaxes to a lower energy state by emitting a 2.55 eV photon.What is the lower energy state?

A 5.0 UV laser emits light that has a wavelength 350 nm.If 1.23 * 10¹⁸ photons are emitted in a pulse,what is the duration of the pulse?

If the period of rotation of electron in the Bohr hydrogen atom is 4.10 fs,which Bohr orbit does the electron occupy?

A collection of hydrogen atoms has been placed into the n = 4 excited state.Which of the following wavelengths of photons will NOT be emitted by the hydrogen atoms as they decay back to the ground state?

A hydrogen atom is in a quantum state with principal quantum number n = 2.The atom absorbs a photon with a wavelength of 660 nm.Determine the maximum possible orbital angular momentum of the electron after absorption.

What is the longest possible wavelength that a hydrogen atom will emit?

The electron in a singly ionized helium atom,which consists of two protons,two neutrons and only one electron,makes a transition from the n = 2 state to the n = 1 state,emitting a single photon in the process.What is the energy of this photon?

What is the wavelength of the photon emitted by a He⁺ when the electron jumps from the n = 7 to the n = 4 state?

An excited hydrogen atom emits a photon with an energy of 0.661 eV.What was the final state of the hydrogen atom after emitting the photon?

The energy contained in a length of a 3.00-mW laser beam in vacuum is 1.80 * 10^-10 J.What is the length of the beam?

The frequency of the line of the Balmer group for the hydrogen spectrum is

In the Bohr model of hydrogen,as the principle quantum number n increases,

What is the magnitude (in N)of the electric force between a proton and a (lowest energy)n = 1 electron in a hydrogen atom?

The Pfund series results from emission/absorption of photons due to transitions of electrons in a hydrogen to/from the n=5 energy level from/to higher energy levels.What is the longest wavelength photon emitted in the Pfund series?

The energy contained in laser beam of length 2.00 m that moves through vacuum is 1.80 * 10^-10 J.What is the power of the laser?

What is the angular momentum of the orbiting electron in a hydrogen atom with quantum number of 45?

The frequency of the line of the Lyman group for the hydrogen spectrum is