The ratio of minimum to maximum wavelength in Balmer series is 

(1) 5 : 9           

(2) 5 : 36

(3) 1 : 4           

(4) 3 : 4

Subtopic:  Spectral Series |
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Rutherford’s α-particle experiment showed that the atoms have

(1) Proton         

(2) Nucleus

(3) Neutron     

(4) Electrons

Subtopic:  Various Atomic Models |
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Which of the following is true for number of spectral lines in going from Lyman series to Pfund series ?

(1) Increases

(2) Decreases

(3) Unchanged

(4) May decreases or increases

Subtopic:  Spectral Series |
 55%
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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

(1) 2.12 Å             

(2) 4.77 Å

(3) 1.06 Å             

(4) 1.59 Å

Subtopic:  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

(1) 29λ             

(2) 92λ
(3) 527λ           

(4) 275λ

Subtopic:  Spectral Series |
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In the following transitions, which one has higher frequency

(1) 3 – 2             

(2) 4 – 3

(3) 4 – 2             

(4) 3 – 1

Subtopic:  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?

(1) 3 and 4           

(2) 2 and 3

(3) 1 and 4           

(4) 4 only

Subtopic:  Various Atomic Models |
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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

(1) 6.75×1012 Hz             

(2) 6.75×1014 Hz

(3) 6.75×1013 Hz             

(4) None of these

Subtopic:  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

(1) 3             

(2) 4

(3) 5             

(4) 6

Subtopic:  Spectral Series |
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The wavelength of light emitted when an electron jumps 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

Subtopic:  Bohr's Model of Atom |
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