An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV. If a hydrogen atom is in the n = 3 state, how much energy is required to ionize it 
(a) 13.6 eV                      (b) 4.53 eV
(c) 3.4 eV                        (d) 1.51 eV

Concept Questions :-

Bohr's model of atom
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Which of the following statements about the Bohr model of the hydrogen atom is false 

(a) Acceleration of electron in n = 2 orbit is less than that in n = 1 orbit

(b) Angular momentum of electron in n = 2 orbit is more than that in n = 1 orbit

(c) Kinetic energy of electron in n = 2 orbit is less than that in n = 1 orbit

(d) Potential energy of electron in n = 2 orbit is less than that in n = 1 orbit

Concept Questions :-

Bohr's model of atom
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The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is

(a) 27 : 5                   (b) 5 : 27
(c) 4 : 1                     (d) 1 : 4

Concept Questions :-

Spectral series
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Which of the following transitions in a hydrogen atom emits photon of the highest frequency

(a) n = 1 to n = 2                (b) n = 2 to n = 1
(c) n = 2 to n = 6                (d) n = 6 to n = 2

Concept Questions :-

Spectral series
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In terms of Rydberg's constant R, the wave number of the first Balmer line is 
(a) R               (b) 3R
(c) 5R36          (d) 8R9

Concept Questions :-

Spectral series
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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

Concept Questions :-

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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