The ionization energy of 10 times ionized sodium atom is:

(1) 13.6 eV            (2) 13.6×11 eV             (3) 13.611eV                  (4) 13.6×(11)2 eV

Concept Questions :-

Bohr's model of atom
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The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of helium atom would be [1988]

(1) 13.6 eV            (2) 27.2 eV           (3) 6.8 eV            (4) 54.4 eV

Concept Questions :-

Bohr's model of atom
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The photon radiated from hydrogen corresponding to the line of Lyman series is absorbed by a hydrogen-like atom X in the excited state.   As a result the hydrogen-like atom X makes a transition to nth orbit. Then:

(1) X = He+, n=4                (2) X = Li++, n = 6

(3) X = He+, n=9                 (4) X = Li++, n = 9

 

Concept Questions :-

Spectral series
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If an electron in an hydrogen atom jumps from an orbit ni=3 to an orbit with level nf=2, the frequency of the emitted radiation is 

(1) v=36 C5 R               (2) v = CR6                (3) v = 5 RC36             (4) v  = 6 CR

Concept Questions :-

Bohr's model of atom
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The energy of a hydrogen atom in its ground state is -13.6 eV. The energy of the level corresponding to the quantum number n = 5 is 

(1) - 0.54 eV          (2) - 5.40 eV          (3) - 0.85 eV          (4) -2.72 eV

Concept Questions :-

Bohr's model of atom
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The wave number of a photon in Brackett series of hydrogen atom is 9400R. The electron has transited from the orbit havit quantum number [Odisha JEE 2012]

(1) 5              (2) 6             (3) 4                 (4) 7

Concept Questions :-

Spectral series
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In an experiment to determine the e/m value for an electron using Thomson's method the electrostatic deflection plates were 0.01 m apart and had a potential difference of 200 volts applied. Then the electric field strength between the plates is 

(1) 1×104 V/m                          (2) 2×104 V/m

(3) 4×104 V/m                          (4) 5×105 V/m

Concept Questions :-

Various atomic model
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Which of the following spectral series in hydrogen atom gives spectral line of 4860 A0?

(1) Lyman          (2) Balmer         (3) Paschen             (4) Brackett

Concept Questions :-

Spectral series
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Hydrogen H11, Deuterium H21, singly ionised Helium H2e4+ and doubly ionised lithium L3i6++ all have one electron around  the nucleus. Consider an electron transition from n = 2 to n = 1. If the wave lengths of emitted radiation are λ1, λ2, λ3 and λ4 respectively then approximately which one of the following is correct [JEE (Main) 2014]

(1) 4λ1=2λ2=2λ3=λ4                  (2) λ1=2λ2=2λ3=λ4

(3) λ1=λ2=4λ3=9λ4                    (4) λ1=2λ2=3λ3=λ4

Concept Questions :-

Bohr's model of atom
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To explain his theory, Bohr used

(1) conservation of linear momentum

(2) conservation of angular momentum

(3) conservation of quantum  frequency

(4) conservation of energy

Concept Questions :-

Bohr's model of atom
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