Radius of the first orbit of the electron in a hydrogen atom is 0.53 Å. So, the radius of the third orbit will be

(a) 2.12 Å             (b) 4.77 Å
(c) 1.06 Å             (d) 1.59 Å

Concept Questions :-

Bohr's model of atom
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The first line in the Lyman series has wavelength $\mathrm{\lambda }$. The wavelength of the first line in Balmer series is

(a) $\frac{2}{9}\mathrm{\lambda }$              (b) $\frac{9}{2}\mathrm{\lambda }$
(c) $\frac{5}{27}\mathrm{\lambda }$            (d) $\frac{27}{5}\mathrm{\lambda }$

Concept Questions :-

Spectral series
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In the following transitions, which one has higher frequency

(a) 3 – 2              (b) 4 – 3
(c) 4 – 2              (d) 3 – 1

Concept Questions :-

Bohr's model of atom
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The diagram shows the path of four $\alpha$-particles of the same energy being scattered by the nucleus of an atom simultaneously. Which of these are/is not physically possible?

(a) 3 and 4            (b) 2 and 3
(c) 1 and 4            (d) 4 only

Concept Questions :-

Various atomic model
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An electron jumps from 5th orbit to 4th orbit of hydrogen atom. Taking the Rydberg constant as  ${10}^{7}$ per metre. What will be the frequency of radiation emitted

(a)               (b)
(c)               (d) None of these

Concept Questions :-

Bohr's model of atom
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Four lowest energy levels of H-atom are shown in the figure. The number of possible emission lines would be

(a) 3             (b) 4
(c) 5             (d) 6

Concept Questions :-

Spectral series
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The order of the size of nucleus and Bohr radius of an atom respectively are
(a)                (b)
(c)                (d)

Concept Questions :-

Bohr's model of atom
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The ratio of the wavelengths for 2 $\to$ 1 transition in ${\mathrm{Li}}^{++}$${\mathrm{He}}^{+}$ and H is
(a) 1 : 2 : 3            (b) 1 : 4 : 9
(c) 4 : 9 : 36           (d) 3 : 2 : 1

Concept Questions :-

Spectral series
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The wavelength of light emitted from second orbit to first orbits in a hydrogen atom is
(a)          (b)
(c)           (d)

Concept Questions :-

Bohr's model of atom
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Energy of the electron in nth orbit of hydrogen atom is given by ${\mathrm{E}}_{\mathrm{n}}=-\frac{13.6}{{\mathrm{n}}^{2}}\mathrm{eV}$. The amount of energy needed to transfer electron from first orbit to third orbit is

(a) 13.6 eV             (b) 3.4 eV
(c) 12.09 eV            (d) 1.51 eV

Concept Questions :-

Bohr's model of atom
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Difficulty Level: