The total energy of an electron in the first excited state of hydrogen is about -3.4 eV. Its kinetic energy in this state is 

(1) -3.4 eV            (2) -6.8 eV             (3) 6.8 eV           (4) 3.4 eV

Concept Questions :-

Bohr's model of atom
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The energy of an electron in excited hydrogen atom is -3.4 eV. Then according to Bohr's theory, the angular momentum of the electron in Js is [Kerala PET 2002]

(1)

(2)

(3)

(4)

(5)

Concept Questions :-

Bohr's model of atom
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When hydrogen atom is in its first excited level, its radius is 

(1) four times, its ground state radius

(2) twice, its ground state radius

(3) same as its ground state radius

(4) half of its ground state radius

Concept Questions :-

Bohr's model of atom
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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)              (3) $\frac{13.6}{11}eV$                  (4)

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 

(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 ${n}^{th}$ orbit. Then:

(1) X =                 (2) X = $L{i}^{++}$, n = 6

(3) X =                  (4) X = $L{i}^{++}$, n = 9

Concept Questions :-

Spectral series
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If an electron in an hydrogen atom jumps from an orbit ${n}_{i}=3$ to an orbit with level ${n}_{f}=2$, the frequency of the emitted radiation is

(1)                (2) v = $\frac{CR}{6}$                (3) v =              (4) v  =

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