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)
(a) 16R              (b) 163R
(c) 165R              (d) 167R

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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 
(a) 4En             (b) En/4
(c) 2En              (d) En/2

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Bohr's model of atom
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What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jump from fourth orbit to second orbit and from third orbit to second orbit

(a) 27 : 25                (b) 20 : 27
(c) 20 : 25                (d) 25 : 27

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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

Concept Questions :-

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 
(a) K two-fold, U four-fold
(b) K four-fold, U two-fold
(c) K four-fold, U also four-fold
(d) K two-fold, U also two-fold

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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

(a) μn             (b) μ1/n
(c) μn2            (d) μ1/n2

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Bohr's model of atom
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Bohr's atom model assumes 
(a) The nucleus is of infinite mass and is at rest
(b) Electrons in a quantized orbit will not radiate energy
(c) Mass of electron remains constant
(d) All the above conditions

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Bohr's model of atom
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Which of the following particles are constituents of the nucleus 
(a) Protons and electrons           (b) Protons and neutrons
(c) Neutrons and electrons         (d) Neutrons and positrons

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Various atomic model
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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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Bohr's model of atom
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A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by

1. 1.05×10-34 J-sec                 2. 3.16×10-34 J-sec
3. 2.11×10-34 J-sec                 4. 4.22×10-34J-sec
(Given Planck constant h = 6.6×10-34 J-sec)

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Bohr's model of atom
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