Q. No.Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be:
1. two
2. three
3. four
4. one
1. \(\frac{RC}{4}\)
2. \(RC\)
3. \(\frac{4}{RC}\)
4. \(4RC\)
Orbital acceleration of electrons is:
1. \(\frac{n^2h^2}{4\pi^2m^2r^3}\)
2. \(\frac{n^2h^2}{4n^2r^3}\)
3. \(\frac{4n^2h^2}{\pi^2m^2r^3}\)
4. \(\frac{4n^2h^2}{4\pi^2m^2r^3}\)
Consider the spectral line resulting from transition \(n=2\) to \(n = 1\) in the atoms and ions given below. The shortest wavelength is given by:
| 1. | hydrogen atom |
| 2. | deuterium |
| 3. | singly ionised helium |
| 4. | doubly ionised lithium |
An particle of energy 5 MeV is scattered through by a fixed uranium nucleus. The distance of closest approach is of the order
1.
2.
3.
4.
Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model:
1. 13.6 eV
2. 0.65 eV
3. 1.9 eV
4. 11.1 eV
(\(h = 6.626\times 10^{-34}\) J-s)
1. \(1.11\times 10^{34}~\text{J-s}\)
2. \(1.51\times 10^{-31}~\text{J-s}\)
3. \(2.11\times 10^{-34}~\text{J-s}\)
4. \(3.72\times 10^{-34}~\text{J-s}\)
As per the Bohr model, the minimum energy (in eV) required to remove the electron from the ground state of a double ionised lithium ion (\(Z=3\)) is:
1. \(1.51\)
2. \(13.6\)
3. \(40.8\)
4. \(122.4\)
The wavelength of Ka X-rays produced by an X-ray tube is 0.76 . Find the atomic number of the anode material of the tube?
1. 41
2. 30
3. 20
4. 10
According to Bohr's theory, the moment of momentum of an electron revolving in second orbit of hydrogen atom will be:
1. \(2\pi h\)
2. \(\pi h\)
3. \(\frac{h}{\pi}\)
4. \(\frac{2h}{\pi}\)
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