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

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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

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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)

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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

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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

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Spectral series
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In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n ?

(a) R/E               (b) E/v
(c) RE                (d) vR

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Bohr's model of atom
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The electric potential between a proton and an electron is given by V=V0lnrr0 where r0 is a constant. Assuming Bohr’s model to be applicable, write variation of rn with n, n being the principal quantum number

(a) rnn            (b)  rn1/n
(c) rnn2           (d) rn1/n2

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Bohr's model of atom
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If the atom Fm100257 follows the Bohr model and the radius of Fm100257 is n times the Bohr radius, then find n

(a) 100                  (b) 200
(c) 4                      (d) 14

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Bohr's model of atom
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