# <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The frequency of the series limit of the Balmer series of hydrogen atoms in terms of Rydberg constant R and velocity of light C is: 1. $\frac{RC}{4}$ 2. RC 3. $\frac{4}{RC}$ 4. 4RC

Subtopic:  Spectral Series |
72%
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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. $$\frac{4n^2h^2}{4\pi^2m^2r^3}$$

Subtopic:  Bohr's Model of Atom |
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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
Subtopic:  Spectral Series |
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An $\alpha -$particle of energy 5 MeV is scattered through $180°$ by a fixed uranium nucleus. The distance of closest approach is of the order

1.

2.

3.

4.

Subtopic:  Various Atomic Models |
From NCERT
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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

Subtopic:  Bohr's Model of Atom |
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The energy of an electron in an excited hydrogen atom is -3.4 eV.  Its angular momentum will be:
(h = 6.626 $×$ 10-34 J-s)

1. 1.11 $×$ 1034 J s

2. 1.51 $×$10-31 J s

3. 2.11 $×$ 10-34 J s

4. 3.72 $×$ 10-34 J s

Subtopic:  Bohr's Model of Atom |
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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

Subtopic:  Bohr's Model of Atom |
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The wavelength of Ka X-rays produced by an X-ray tube is 0.76 $\stackrel{\circ }{A}$. Find the atomic number of the anode material of the tube?

1. 41

2. 30

3. 20

4. 10

Subtopic:  X-Ray (OLD NCERT) |
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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. $$\frac{2h}{\pi}$$

Subtopic:  Bohr's Model of Atom |
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The ionisation energy of a hydrogen atom is 13.6 eV. Following Bohr's theory, what is the energy corresponding to a transition between the 3rd and 4th orbit?
1. 3.40 eV
2. 1.51 eV
3. 0.85 eV
4. 0.66 eV

Subtopic:  Bohr's Model of Atom |
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