The minimum energy required to excite a hydrogen atom from its ground state is

(a) 13.6 eV                   (b) -13.6 eV
(c) 3.4 eV                     (d) 10.2 eV

Concept Questions :-

Bohr's model of atom
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Ratio of the wavelengths of first line of Lyman series and first line of Balmer series is
(a) 1: 3                  (b) 27 : 5
(c) 5 : 27               (d) 4 : 9

Concept Questions :-

Spectral series
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The velocity of an electron in the second orbit of sodium atom (atomic number = 11) is v. The velocity of an electron in its fifth orbit will be
(a) v            (b) $\frac{22}{5}v$
(c) $\frac{5}{2}\mathrm{v}$        (d) $\frac{2}{5}\mathrm{v}$

Concept Questions :-

Bohr's model of atom
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The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be
(a) 3              (b) 4
(c) 5              (d) 6

Concept Questions :-

Spectral series
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The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is
(a) $\frac{4}{3}$             (b) $\frac{525}{376}$
(c) 25             (d) $\frac{900}{11}$

Concept Questions :-

Spectral series
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In Bohr's model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level

(a) PE decreases, TE increases

(b) PE increases, TE increases

(c) PE decreases, TE decreases

(d) PE increases, TE decreases

Concept Questions :-

Bohr's model of atom
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According to Bohr's model, the radius of the second orbit of helium atom is
(a) 0.53 Å             (b) 1.06 Å
(c) 2.12 Å             (d) 0.265 Å

Concept Questions :-

Bohr's model of atom
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The fact that photons carry energy was established by

(a) Doppler's effect               (b) Compton's effect
(c) Bohr's theory                   (d) Diffraction of light

Concept Questions :-

Bohr's model of atom
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An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be
(a) ${\mathrm{He}}^{+}$         (b) ${\mathrm{Li}}^{++}$
(c) ${\mathrm{Ne}}^{9+}$        (d) ${\mathrm{Na}}^{10+}$

Concept Questions :-

Spectral series
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The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
(a) 3.4 eV                (b) 13.6 eV
(c) 54.4 eV              (d) 122.4 eV

Concept Questions :-

Spectral series
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