An electron has a mass of 9.1×10-31 kg. It revolves round the nucleus in a circular orbit of radius 0.529×10-10 metre at a speed of 2.2×106 m/s. The magnitude of its linear momentum in this motion is

(a) 1.1×10-34 kg-m/s             (b) 2.0×10-24 kg-m/s 
(c) 4.0×10-24 kg-m/s           (d) 4.0×10-31 kg-m/s

Concept Questions :-

Various atomic model
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The ionization potential for second He electron is
(a) 13.6 eV                 (b) 27.2 eV
(c) 54.4 eV                 (d) 100 eV

Concept Questions :-

Bohr's model of atom
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The energy required to remove an electron in a hydrogen atom from n = 10 state is 
(a) 13.6 eV                   (b) 1.36 eV
(c) 0.136 eV                  (d) 0.0136 eV

Concept Questions :-

Bohr's model of atom
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Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to 18752 Å is 
(a) Balmer series                (b) Lyman series
(c) Paschen series               (d) Pfund series

(Rydberg constant R = 1.097×107 per metre)

Concept Questions :-

Spectral series
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The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge) 
(a) e2r2                (b) e22r
(c) e2r                (d) e22r2

Concept Questions :-

Bohr's model of atom
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Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e. EA<EB<EC. If λ1, λ2, λ3 are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct

(a) λ3=λ1+λ2                      (b) λ3=λ1λ2λ1+λ2
(c) λ1+λ2+λ3=0                 (d) λ32=λ12+λ22

Concept Questions :-

Spectral series
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The angular momentum of electron in nth orbit is given by

(a) nh                 (b) h2πn 
(c) nh2π             (d) n2h2π

Concept Questions :-

Bohr's model of atom
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The ratio of the energies of the hydrogen atom in its first to second excited state is 
(a) 1/ 4                    (b) 4/9
(c) 9/ 4                     (d) 4

Concept Questions :-

Bohr's model of atom
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An electron jumps from the 4th orbit to the 2nd orbit of hydrogen atom. Given the Rydberg's constant R = 105 cm-1. The frequency in Hz of the emitted radiation will be 
(a) 316×105           (b) 316×1015
(c) 916×1015          (d) 34×1015

Concept Questions :-

Bohr's model of atom
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The ionisation potential of hydrogen atom is 13.6 volt. The energy required to remove an electron in the n = 2 state of the hydrogen atom is 
(a) 27.2 eV                (b) 13.6 eV
(c) 6.8 eV                  (d) 3.4 eV

Concept Questions :-

Bohr's model of atom
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