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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The de-Broglie wavelength of an electron in the first Bohr orbit is 

(1) Equal to one fourth the circumference of the first orbit

(2) Equal to half the circumference of the first orbit

(3) Equal to twice the circumference of the first orbit

(4) Equal to the circumference of the first orbit

Subtopic:  Bohr's Model of Atom |
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The frequency of 1st line of Balmer series in H2 atom is v0. The frequency of line emitted by singly ionised He atom is

(1) 2v0          

(2) 4v0

(3) v0/2         

(4) v0/4

Subtopic:  Spectral Series |
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When the electron in the hydrogen atom jumps from 2nd orbit to 1st orbit, the wavelength of radiation emitted is λ. When the electrons jump from 3rd orbit to 1st orbit, the wavelength of emitted radiation would be

 
(1) 2732λ             

(2) 3227λ

(3) 23λ               

(4) 32λ

Subtopic:  Spectral Series |
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Which of the following transition will have shortest emission wavelength ?

(1) n = 2 to n =1           

(2) n = 1 to n = 2 

(3) n = 2 to n = 5         

(4) n = 5 to n = 2 

Subtopic:  Spectral Series |
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If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is 

(1) 122.4 eV       

(2) 30.6 eV

(3) 13.6 eV         

(4) 3.4 eV

Subtopic:  Bohr's Model of Atom |
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Which state of triply ionised Beryllium Be+++ has the same orbital radius as that of the ground state of hydrogen

(1) n = 4                 

(2) n = 3

(3) n = 2                 

(4) n = 1

Subtopic:  Bohr's Model of Atom |
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