A hydrogen atom is in its first excited state (n = 2). Using the Bohr theory of the atom, calculate the angular momentum of the electron.

A hydrogen atom is in its first excited state (n = 2). Using the Bohr theory of the atom, calculate the radius of the orbit.

A hydrogen atom is in its first excited state (n = 2). Using the Bohr theory of the atom, calculate the kinetic energy.

A hydrogen atom is in its first excited state (n = 2). Using the Bohr theory of the atom, calculate the linear momentum of the electron,

Determine if the differential equation is separable, and if so, write it in the form h(y)dy = g(x)dx. $y^{\prime}=x e^{y}-x$

Singly ionized helium ($He^+$) is a hydrogen-like atom. Determine the energy in eV required to raise a $He^+$ electron from the $n = 1$ to the $n = 2$ energy level.

A hydrogen atom is in its first excited state (n = 2). Calculate the potential energy of the system.

A hydrogen atom is in its second excited state, $n=3$. Using the Bohr model of hydrogen, find the linear momentum of the electron in this atom.

A hydrogen atom is in its first excited state (n = 2). Calculate the kinetic energy of the electron.

When light of wavelength 350 nm falls on a potassium surface, electrons having a maximum kinetic energy of 1.31 eV are emitted. Find the frequency corresponding to the cutoff wavelength.

The so-called Lyman-$\alpha$ photon is the lowest energy photon in the Lyman series of hydrogen and results from an electron transitioning from the n = 2 to the n = 1 energy level. Determine the wavelength in nm of a Lyman-$\alpha$ photon.

When light of wavelength 350 nm falls on a potassium surface, electrons having a maximum kinetic energy of 1.31 eV are emitted. Find the cutoff wavelength.

In accordance with the cartoonist, what might be the result of the U.S. membership in the League of Nations?