The ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be

(1) 24.6 eV            (2) 24.6 volt          (3) 13.6 volt                 (4) 13..6 eV

Concept Questions :-

Various atomic model
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Ratio of the wavelength of first line of Lyman series and first line of Balmer series is [EAMCET (Engg. 1995; MP PMT 1997; UPSEAT 2004; KCET 2006; NEET 2013]

(1) 1 : 3           (2) 27 : 5               (3) 5 : 27                 (4) 4 : 9

Concept Questions :-

Spectral series
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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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