If the wavelength of the first line of the Balmer series of hydrogen is 6561 A0, the wavelength of the second line of the series should be 
(a) 13122 A0                  (b) 3280 A0
(c) 4860 A0                    (d) 2187 A0

Concept Questions :-

Spectral series
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A beam of fast moving alpha particles were directed towards a thin film of gold. The parts A',B', and C' of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in

(a) B' will be minimum and in C' maximum
(b) A' will be maximum and in B' minimum
(c) A' will be minimum and in B' maximum
(d) C' will be minimum and in B' maximum

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Various atomic model
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According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to 
(a) Z2n2            (b) Z2n2
(c) Z2n              (d) n2Z

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Bohr's model of atom
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The radius of electron's second stationary orbit in Bohr's atom is R. The radius of the third orbit will be

(a) 3 R                    (b) 2.25 R
(c) 9 R                    (d) R3

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Bohr's model of atom
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If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr's first postulate, the kinetic energy K=12mv2 of the electron in C.G.S. system is equal to

(a) 12Ze2r                             (b) 12Ze2r2
(c) Ze2r                                 (d) Ze2r2

Concept Questions :-

Bohr's model of atom
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In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is
(a) 1/2                    (b) 2
(c) -1/2                (d) – 2

Concept Questions :-

Bohr's model of atom
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The spectral series of the hydrogen spectrum that lies in the ultraviolet region is the

(a) Balmer series                 (b) Pfund series
(c) Paschen series                (d) Lyman series

Concept Questions :-

Spectral series
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Figure shows the energy levels P, Q, R, S and G of an atom where G is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from Q to S. A blue line can be obtained by following energy level change 

(a) P to Q (b) Q to R
(c) R to S (d) R to G

Concept Questions :-

Spectral series
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A hydrogen atom (ionisation potential 13.6 eV) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is 
(a) 1.89 eV                (b) 2.55 eV
(c) 12.09 eV              (d) 12.75 eV

Concept Questions :-

Bohr's model of atom
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The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. 5 arises from the transition from level B to A). The following spectral lines will also occur in the absorption spectrum

(a) 1, 4, 6                      (b) 4, 5, 6
(c) 1, 2, 3                      (d) 1, 2, 3, 4, 5, 6

Concept Questions :-

Spectral series
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