# The ratio of the energies of the hydrogen atom in its first to second excited states is 1. $\frac{1}{4}$  2. $\frac{4}{9}$ 3. $\frac{9}{4}$ 4. 4

Subtopic:  Bohr's Model of Atom |
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Energy levels A, B, C of a certain atom correspond to increasing values of energy i.e. ${E}_{A}<{E}_{B}<{E}_{C}.$ If  are the wavelengths of the radiation corresponding to the transitions C to B, B to A and C to A respectively, which of the following relation is correct?

1. ${\lambda }_{3}={\lambda }_{1}+{\lambda }_{2}$

2. ${\lambda }_{3}=\frac{{\lambda }_{1}{\lambda }_{2}}{{\lambda }_{1}+{\lambda }_{2}}$

3. ${\lambda }_{1}+{\lambda }_{2}+{\lambda }_{3}=0$

4. ${\lambda }_{3}^{2}={\lambda }_{1}^{2}+{\lambda }_{2}^{2}$

Subtopic:  Spectral Series |
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In the Rutherford scattering experiment, what will be the correct angle for $\propto$-scattering for an impact parameter, b = 0?

1. ${90}^{\circ }$

2. ${270}^{\circ }$

3. ${0}^{\circ }$

4. ${180}^{\circ }$

Subtopic:  Various Atomic Models |
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The velocity of the electron in the ground state (H - atom) is

1.

2.

3.

4.

Subtopic:  Various Atomic Models |
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The element which has K$\alpha$ X-ray line whose wavelength is 0.18 nm is:

1. Cobalt

2.  Xenon

3. Copper

4. Iron

Subtopic:  Spectral Series |
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Calculate the highest frequency of the emitted photon in the Paschen series of spectral lines of the Hydrogen atom:

1.

2.

3.

4.

Subtopic:  Spectral Series |
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The energy of $$24.6$$ eV is required to remove one of the electrons from a neutral helium atom. What is the energy (in eV) required to remove both the electrons from a neutral helium atom?
1. $$38.2$$
2. $$49.2$$
3. $$51.8$$
4. $$79.0$$

Subtopic:  Bohr's Model of Atom |
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Which of the following transitions gives photon of maximum energy?

1. n = 1 to n = 2

2. n = 2 to n = 1

3. n = 2 to n = 6

4. n = 6 to n = 2

Subtopic:  Bohr's Model of Atom |
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Hydrogen atoms are excited from ground state of the principal quantum number 4. Then, the number of spectral lines observed will be

1. 3

2. 6

3. 5

4. 2

Subtopic:  Spectral Series |
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When electron jumps from n = 4 to n = 2 orbit, we get [2000]

1. second line of Lyman series

2. second line of Balmer series

3. second line of Paschen series

4. an absorption line of Balmer series

Subtopic:  Spectral Series |
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