# 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 |
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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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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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