Which of the following transitions in a hydrogen atom emits photon of the highest frequency

(a) n = 1 to n = 2                (b) n = 2 to n = 1
(c) n = 2 to n = 6                (d) n = 6 to n = 2

Concept Questions :-

Spectral series
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In terms of Rydberg's constant R, the wave number of the first Balmer line is
(a) R               (b) 3R
(c) $\frac{5\mathrm{R}}{36}$          (d) $\frac{8\mathrm{R}}{9}$

Concept Questions :-

Spectral series
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Which of the transitions in hydrogen atom emits a photon of lowest frequency (n = quantum number)
(a) n = 2 to n = 1              (b) n = 4 to n = 3
(c) n = 3 to n = 1              (d) n = 4 to n = 2

Concept Questions :-

Spectral series
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According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
(a)$+\frac{{\mathrm{e}}^{2}}{8{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$ and  $-\frac{{\mathrm{e}}^{2}}{4{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$            (b) $+\frac{8{\mathrm{\pi \epsilon }}_{0}{\mathrm{e}}^{2}}{\mathrm{r}}$ and $-\frac{4{\mathrm{\pi \epsilon }}_{0}{\mathrm{e}}^{2}}{\mathrm{r}}$
(c) $-\frac{{\mathrm{e}}^{2}}{8{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$ and $-\frac{{\mathrm{e}}^{2}}{4{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$            (d) $+\frac{{\mathrm{e}}^{2}}{8{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$ and $+\frac{{\mathrm{e}}^{2}}{4{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$

Concept Questions :-

Bohr's model of atom
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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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