The wavelength of the energy emitted when electron come from fourth orbit to second orbit in hydrogen is 20.397 cm. The wavelength of energy for the same transition in He+ is

(a) 5.099 cm-1             (b) 20.497 cm-1
(c) 40.994 cm-1            (d) 81.988 cm-1

Concept Questions :-

Bohr's model of atom
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Minimum excitation potential of Bohr's first orbit in hydrogen atom is
(a) 13.6 V                     (b) 3.4 V
(c) 10.2 V                     (d) 3.6 V

Concept Questions :-

Bohr's model of atom
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Which of the following statements are true regarding Bohr's model of hydrogen atom

(I) Orbiting speed of electron decreases as it shifts to
discrete orbits away from the nucleus

(II) Radii of allowed orbits of electron are proportional to the cube of principal quantum number

(III) Frequency with which electrons orbits around the nucleus in discrete orbits is inversely proportional to the principal quantum number

(IV) Binding force with which the electron is bound to the nucleus increases as it shifts to outer orbits
Select correct answer using the codes given below
Codes :
(a) I and III                 (b) II and IV
(c) I, II and III            (d) II, III and IV

Concept Questions :-

Bohr's model of atom
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 For electron moving in nth orbit of H-atom the angular velocity is proportional to 
(a) n                       (b) 1/n
(c) n3                     (d) 1/n3

Concept Questions :-

Bohr's model of atom
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The energy of electron in first excited state of H-atom is -3.4 eV its kinetic energy is

(a) – 3.4 eV                 (b) + 3.4 eV
(c) – 6.8 eV                 (d) 6.8 eV

Concept Questions :-

Bohr's model of atom
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Which of the following phenomena suggests the presence of electron energy levels in atoms 

(a) Radio active decay

(b) Isotopes

(c) Spectral lines

(d) α-particles scattering

Concept Questions :-

Various atomic model
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Which of the following spectral series in hydrogen atom give spectral line of 4860 Å 
(a) Lyman               (b) Balmer
(c) Paschen             (d) Brackett

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Spectral series
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When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h = 6.6×10-34 J-s6.6)

(a) 4.16×10-34 J-s               (b) 3.32×10-34 J-s
(c) 1.05×10-34 J-s               (d) 2.08×10-34 J-s

Concept Questions :-

Bohr's model of atom
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The concept of stationary orbits was proposed by

(a) Neil Bohr              (b) J.J. Thomson
(c) Ruther ford           (d) I. Newton

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Various atomic model
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What will be the angular momentum of a electron, if energy of this electron in H-atom is 1.5eV (in J-sec) 
(a) 1.05×10-34           (b) 2.1×10-34
(c) 3.15×10-34           (d)  -2.1×10-34

Concept Questions :-

Bohr's model of atom
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