Which one of the relation is correct between time period and number of orbits while an electron is revolving in a orbit

(a) ${\mathrm{n}}^{2}$              (b) $\frac{1}{{\mathrm{n}}^{2}}$
(c) ${\mathrm{n}}^{3}$              (d) $\frac{1}{\mathrm{n}}$

Concept Questions :-

Bohr's model of atom
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An electron changes its position from orbit n = 4 to the orbit n = 2 of an atom. The wavelength of the emitted radiation’s is (R = Rydberg’s constant)
(a) $\frac{16}{\mathrm{R}}$              (b) $\frac{16}{3\mathrm{R}}$
(c) $\frac{16}{5\mathrm{R}}$              (d) $\frac{16}{7\mathrm{R}}$

Concept Questions :-

Bohr's model of atom
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If the energy of a hydrogen atom in nth orbit is ${\mathrm{E}}_{\mathrm{n}}$, then energy in the nth orbit of a singly ionized helium atom will be
(a) 4${\mathrm{E}}_{\mathrm{n}}$             (b) ${\mathrm{E}}_{\mathrm{n}}$/4
(c) 2${\mathrm{E}}_{\mathrm{n}}$              (d) ${\mathrm{E}}_{\mathrm{n}}$/2

Concept Questions :-

Bohr's model of atom
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What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jump from fourth orbit to second orbit and from third orbit to second orbit

(a) 27 : 25                (b) 20 : 27
(c) 20 : 25                (d) 25 : 27

Concept Questions :-

Bohr's model of atom
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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

Concept Questions :-

Bohr's model of atom
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The magnetic moment $\left(\mathrm{\mu }\right)$ of a revolving electron around the nucleus varies with principal quantum number n as

(a) $\mathrm{\mu }\propto \mathrm{n}$             (b) $\mathrm{\mu }\propto 1/\mathrm{n}$
(c) $\mathrm{\mu }\propto {\mathrm{n}}^{2}$            (d) $\mathrm{\mu }\propto 1/{\mathrm{n}}^{2}$

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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