Which one of the following statements is not true?

What is the shortest wavelength present in the Paschen series of spectral lines?
1. $818.9~\text{nm}$
2. $779~\text{nm}$
3. $500~\text{nm}$
4. $1024~\text{nm}$

A difference of $2.3$ eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?
1. $6.6\times10^{14}$ Hz
2. $5.6\times10^{14}$ Hz
3. $9.3\times10^{14}$ Hz
4. $7.9\times10^{14}$ Hz

The ground state energy of the hydrogen atom is $-13.6~ \text {eV}.$ What is the potential energy of the electron in this state?
1. $-13.6~\text{eV}$
2. $27.2~\text {eV}$
3. $-27.2~ \text {eV}$
4. $13.6~\text {eV}$

The radius of the innermost electron orbit of a hydrogen atom is $5.3\times10^{-11}$ m. What is the radius of the $n=2$ orbit?
1. $1.67 ~\mathring A$
2. $4.77~\mathring A$
3. $2.12~\mathring A$
4. $3.11~\mathring A$

A hydrogen atom initially in the ground level absorbs a photon, which excites it to the $n=4$ level. The wavelength of the photon is:

The speed of the electron in a hydrogen atom in the ${n=1}$ level is:
1. $1.1 \times10^{6} ~\text{m/s}$
2. $2.18 \times10^{6} ~\text{m/s}$
3. $1.08\times10^{6} ~\text{m/s}$
4. $3.07 \times10^{6} ~\text{m/s}$

In accordance with Bohr’s model, what is the quantum number that characterizes the earth’s revolution around the sun in an orbit of radius $1.5\times {10}^{11} m$  with orbital speed $3\times {10}^4 m/s$? (Mass of earth = $6.0\times {10}^{24} kg.$)

1.  $1.8\times 10^{76}$
2. $2.3 \times10^{74}$
3. $1.3 \times10^{76}$
4. $2.6 \times10^{74}$

The total energy of an electron in the first excited state of the hydrogen atom is about $-3.4$ eV. What is the kinetic energy of the electron in this state?
1. $3.4$ eV
2. $-3.4$ eV
3. $3.2$ eV
4. $-3.2$ eV

The total energy of an electron in the first excited state of the hydrogen atom is about -3.4 eV. What is the potential energy of the electron in this state?

1. 6.8 eV
2. -6.8 eV
3. 0
4. 3.4 eV