Mention the value of the Rydberg constant with its unit.

The velocity of an electron in the first Bohr orbit of $He^+$ ion is .......

$A$ beam of monochromatic light is used to excite the electron in $Li^{++}$ from the first orbit to the third orbit. The wavelength of monochromatic light is found to be $x \times 10^{-10} \; m$. The value of $x$ is $\dots$. [Given $hc = 1242 \; eV \cdot nm$]

Which of the following statements about the Bohr model of the hydrogen atom is false?

In Bohr's model of the hydrogen atom,which of the following pairs of quantities are quantized?

The time period of revolution of an electron in the $n^{\text{th}}$ orbit in a hydrogen-like atom is given by $T = \frac{T_0 n^a}{Z^b}$,where $Z$ is the atomic number. Identify the correct values for $T_0$,$a$,and $b$.