The kinetic energy of electron in the first Bohr orbit of the hydrogen atom is 
(a) – 6.5 eV               (b) – 27.2 eV
(c) 13.6 eV                (d) – 13.6 eV

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Bohr's model of atom
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In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized 
(a) Energy and linear momentum
(b) Linear and angular momentum
(c) Energy and angular momentum
(d) None of the above

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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
(a) 13.6 eV              (b) 3.4 eV
(c) 1.5 eV                (d) 0.85 eV

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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

(a) n2              (b) 1n2
(c) n3              (d) 1n

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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)
(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

Concept Questions :-

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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