Which of the following is true for number of spectral lines in going form Layman series to Pfund series 
(a) Increases
(b) Decreases
(c) Unchanged
(d) May decreases or increases

Concept Questions :-

Spectral series
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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 λ. The wavelength of the first line in Balmer series is

(a) 29λ              (b) 92λ
(c) 527λ            (d) 275λ

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 α-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  107 per metre. What will be the frequency of radiation emitted

(a) 6.75×1012 Hz              (b) 6.75×1014 Hz
(c) 6.75×1013 Hz              (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) 10-14 m, 10-10 m               (b) 10-10 m, 10-8 m 
(c) 10-20 m, 10-16 m               (d) 10-8 m, 10-6 m

Concept Questions :-

Bohr's model of atom
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The ratio of the wavelengths for 2  1 transition in Li++He+ and H is-

1. 1 : 2 : 3           

2.  1 : 4 : 9

3. 4 : 9 : 36           

4. 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) 1.215×10-7 m         (b) 1.215×10-5 m
(c) 1.215×10-4 m          (d) 1.215×10-3 m

Concept Questions :-

Bohr's model of atom
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