In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized 

(1) Energy and linear momentum

(2) Linear and angular momentum

(3) Energy and angular momentum

(4) None of the above

Subtopic:  Bohr's Model of Atom |
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The energy of the highest energy photon of Balmer series of hydrogen spectrum is close to
(1) 13.6 eV             

(2) 3.4 eV

(3) 1.5 eV               

(4) 0.85 eV

Subtopic:  Spectral Series |
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Which one of the relation is correct between time period and number of orbits while an electron is revolving in a orbit

(1) n2             

(2) 1n2

(3) n3             

(4) 1n

Subtopic:  Bohr's Model of Atom |
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An electron changes its position from orbit n = 4 to the orbit n = 2 of an atom. The wavelength of the emitted radiation’s is (R = Rydberg’s constant)

(1) 16R             

(2) 163R

(3) 165R             

(4) 167R

Subtopic:  Bohr's Model of Atom |
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If the energy of a hydrogen atom in nth orbit is En, then energy in the nth orbit of a singly ionized helium atom will be 

(1) 4En             

(2) En/4

(3) 2En             

(4) En/2

Subtopic:  Bohr's Model of Atom |
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The ground state energy of hydrogen atom is – 13.6 eV. What is the potential energy of the electron in this state

1. 0 eV                       

2. – 27.2 eV

3. 1 eV                       

4. 2 eV

Subtopic:  Bohr's Model of Atom |
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As the electron in Bohr orbit of Hydrogen atom passes from state n = 2 to n = 1 , the kinetic energy K and potential energy U change as 

(1) K two-fold, U four-fold

(2) K four-fold, U two-fold

(3) K four-fold, U also four-fold

(4) K two-fold, U also two-fold

Subtopic:  Bohr's Model of Atom |
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The magnetic moment μ of a revolving electron around the nucleus varies with principal quantum number n as

(1) μn            

(2) μ1/n

(3) μn2           

(4) μ1/n2

Subtopic:  Bohr's Model of Atom |
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Bohr's atom model assumes 

(1) The nucleus is of infinite mass and is at rest

(2) Electrons in a quantized orbit will not radiate energy

(3) Mass of electron remains constant

(4) All the above conditions

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The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is

1. 1/2                2. 2/137
3. 1/137            4. 1/237

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