The K$\propto$ line obtained for molybdenum (Z = 42) target is 0.71 $\stackrel{\circ }{A}$. Then, the wavelength of the ${K}_{\alpha }$ line of copper (Z = 29) is:

(A) 2.14 $\stackrel{\circ }{A}$                               (B) 1.52 $\stackrel{\circ }{A}$

(C) 1.04 $\stackrel{\circ }{A}$                               (D) 0.71 $\stackrel{\circ }{A}$

Concept Questions :-

Spectral series
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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

Concept Questions :-

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

Concept Questions :-

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?

(a) ${90}^{\circ }$                                  (b) ${270}^{\circ }$

(c) ${0}^{\circ }$                                    (d) ${180}^{\circ }$

Concept Questions :-

Various atomic model
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The velocity of the electron in the ground state (H - atom) is

(1)              (2)

(3)              (4)

Concept Questions :-

Various atomic model
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When element has a  line whose wavelength is 0.180 nm?

(1) Cobalt             (2) Xenon          (3) Copper             (4) Iron

Concept Questions :-

Spectral series
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Atoms having different atomic number as well as different mass number but having same number of neutrons

1. isotopes                          2. isobars

3. isotones                          4. isodiaphers

Concept Questions :-

Various atomic model
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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)

Concept Questions :-

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. The energy in (eV) required to remove both the electrons from a neutral helium atom is:

1.  38.2

2.  49.2

3.  51.8

4.  79.0

Concept Questions :-

Bohr's model of atom
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The wavelength of radiation emitted is ${\lambda }_{0}$ when an electron jumps from the third to the second orbit of hydrogen atom. For the electron jump from the fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be

(a) $\frac{16}{25}{\lambda }_{0}$                               (b) $\frac{20}{27}{\lambda }_{0}$

(c) $\frac{27}{20}{\lambda }_{0}$                               (d) $\frac{25}{16}{\lambda }_{0}$

Concept Questions :-

Bohr's model of atom
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