The de-Broglie wavelength of an electron in the first Bohr orbit is 
(a) Equal to one fourth the circumference of the first orbit
(b) Equal to half the circumference of the first orbit
(c) Equal to twice the circumference of the first orbit
(d) Equal to the circumference of the first orbit

Concept Questions :-

Bohr's model of atom
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The frequency of 1st line of Balmer series in H2 atom is v0. The frequency of line emitted by singly ionised He atom is

(a) 2v0           (b) 4v0
(c) v0/2          (d) v0/4

Concept Questions :-

Spectral series
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When the electron in the hydrogen atom jumps from 2nd orbit to 1st orbit, the wavelength of radiation emitted is λ. When the electrons jump from 3rd orbit to 1st orbit, the wavelength of emitted radiation would be 
(a) 2732λ             (b) 3227λ
(c) 23λ               (d) 32λ

Concept Questions :-

Spectral series
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Which of the following transition will have shortest emission wavelength ?
(a) n = 2 to n =1           (b) n = 1 to n = 2 
(c) n = 2 to n = 5          (d) n = 5 to n = 2 

Concept Questions :-

Spectral series
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If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is 
(a) 122.4 eV        (b) 30.6 eV
(c) 13.6 eV          (d) 3.4 eV

Concept Questions :-

Bohr's model of atom
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Which state of triply ionised Beryllium Be+++ has the same orbital radius as that of the ground state of hydrogen

(a) n = 4                  (b) n = 3
(c) n = 2                  (d) n = 1

Concept Questions :-

Bohr's model of atom
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The ratio of areas within the electron orbits for the first excited state to the ground state for hydrogen atom is

1. 16 : 1             2. 18 : 1
3. 4 : 1               4. 2 : 1

Concept Questions :-

Bohr's model of atom
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Taking Rydberg’s constant RH=1.097×107 m first and second wavelength of Balmer series in hydrogen spectrum is

(a) 2000 Å, 3000 Å                  (b) 1575 Å, 2960 Å
(c) 6529 Å, 4280 Å                  (d) 6552 Å, 4863 Å

Concept Questions :-

Spectral series
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The kinetic energy of electron in the first Bohr orbit of the hydrogen atom is 
(a) – 6.5 eV               (b) – 27.2 eV
(c) 13.6 eV                (d) – 13.6 eV

Concept Questions :-

Bohr's model of atom
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In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized 
(a) Energy and linear momentum
(b) Linear and angular momentum
(c) Energy and angular momentum
(d) None of the above

Concept Questions :-

Bohr's model of atom
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