Which of the transitions in hydrogen atom emits a photon of lowest frequency (n = quantum number)
(a) n = 2 to n = 1              (b) n = 4 to n = 3
(c) n = 3 to n = 1              (d) n = 4 to n = 2

Concept Questions :-

Spectral series
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According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
(a)+e28πε0r and  -e24πε0r            (b) +8πε0e2r and -4πε0e2r
(c) -e28πε0r and -e24πε0r            (d) +e28πε0r and +e24πε0r

Concept Questions :-

Bohr's model of atom
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The minimum energy required to excite a hydrogen atom from its ground state is

(a) 13.6 eV                   (b) -13.6 eV 
(c) 3.4 eV                     (d) 10.2 eV

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Bohr's model of atom
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Ratio of the wavelengths of first line of Lyman series and first line of Balmer series is
(a) 1: 3                  (b) 27 : 5
(c) 5 : 27               (d) 4 : 9

Concept Questions :-

Spectral series
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The velocity of an electron in the second orbit of sodium atom (atomic number = 11) is v. The velocity of an electron in its fifth orbit will be 
(a) v            (b) 225v  
(c) 52v        (d) 25v

Concept Questions :-

Bohr's model of atom
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The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be 
(a) 3              (b) 4
(c) 5              (d) 6

Concept Questions :-

Spectral series
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The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is 
(a) 43             (b) 525376
(c) 25             (d) 90011

Concept Questions :-

Spectral series
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In Bohr's model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level 

(a) PE decreases, TE increases

(b) PE increases, TE increases

(c) PE decreases, TE decreases

(d) PE increases, TE decreases

Concept Questions :-

Bohr's model of atom
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 According to Bohr's model, the radius of the second orbit of helium atom is 
(a) 0.53 Å             (b) 1.06 Å
(c) 2.12 Å             (d) 0.265 Å

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Bohr's model of atom
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The fact that photons carry energy was established by

(a) Doppler's effect               (b) Compton's effect
(c) Bohr's theory                   (d) Diffraction of light

Concept Questions :-

Bohr's model of atom
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