The ground state energy of hydrogen atom is – 13.6 eV. What is the potential energy of the electron in this state

1. 0 eV                       2. – 27.2 eV
3. 1 eV                       4. 2 eV

Concept Questions :-

Bohr's model of atom
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As the electron in Bohr orbit of Hydrogen atom passes from state n = 2 to n = 1 , the kinetic energy K and potential energy U change as 
(a) K two-fold, U four-fold
(b) K four-fold, U two-fold
(c) K four-fold, U also four-fold
(d) K two-fold, U also two-fold

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Bohr's model of atom
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The magnetic moment μ of a revolving electron around the nucleus varies with principal quantum number n as

(a) μn             (b) μ1/n
(c) μn2            (d) μ1/n2

Concept Questions :-

Bohr's model of atom
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Bohr's atom model assumes 
(a) The nucleus is of infinite mass and is at rest
(b) Electrons in a quantized orbit will not radiate energy
(c) Mass of electron remains constant
(d) All the above conditions

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Bohr's model of atom
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Which of the following particles are constituents of the nucleus 
(a) Protons and electrons           (b) Protons and neutrons
(c) Neutrons and electrons         (d) Neutrons and positrons

Concept Questions :-

Various atomic model
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The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is

1. 1/2                2. 2/137
3. 1/137            4. 1/237

Concept Questions :-

Bohr's model of atom
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A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by

1. 1.05×10-34 J-sec                 2. 3.16×10-34 J-sec
3. 2.11×10-34 J-sec                 4. 4.22×10-34J-sec
(Given Planck constant h = 6.6×10-34 J-sec)

Concept Questions :-

Bohr's model of atom
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Hydrogen (H), deuterium (D), singly ionized helium and doubly ionized lithium all have one electron around the nucleus. Consider n =2 to n = 1 transition. The wavelengths of emitted radiations are λ1,λ2,λ3 and λ4 respectively. Then approximately 
(a) λ1=λ2=4λ3=9λ4                             (b) 4λ1=2λ2=2λ3=λ4
(c) λ1=2λ2=22λ3=32λ4                 (d) λ1=λ2=2λ3=32λ4

Concept Questions :-

Bohr's model of atom
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Imagine an atom made up of a proton and a hypothetical particle of double the mass of the electron but having the same charge as the electron. Apply the Bohr atom model and consider all possible transitions of this hypothetical particle to the first excited level. The longest wavelength photon that will be emitted has wavelength λ (given in terms of the Rydberg constant R for the hydrogen atom) equal to

(a) 9/(5R)                 (b) 36/(5R)
(c) 18/(5R)                (d) 4/R

Concept Questions :-

Bohr's model of atom
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The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition 
(a) 21                  (b) 32
(c) 42                  (d) 54

Concept Questions :-

Spectral series
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