Which of the following is the energy of a possible excited state of hydrogen? $........... \ eV$

The ratio between kinetic energy and the total energy of the electrons of a hydrogen atom according to Bohr's model is

The potential energy of an electron present in $He^{+}$ is:

Which are the drawbacks of Rutherford's atomic model?

Based on the equation $\Delta E = - 2.0 \times 10^{-18} \, J \left( \frac{1}{n_2^2} - \frac{1}{n_1^2} \right)$,the wavelength of the light that must be absorbed to excite a hydrogen electron from level $n = 1$ to level $n = 2$ will be: $(h = 6.625 \times 10^{-34} \, J \, s, c = 3 \times 10^8 \, m \, s^{-1})$

The space between the proton and the electron in a hydrogen atom is: