Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be:

(1) two          (2) three         (3) four             (4) one

Concept Questions :-

Spectral series
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Frequency of the series limit of Balmer series of hydrogen atom in terms of Rydberg constant R and velocity of light C is:

(1) $\frac{RC}{4}$           (2) RC            (3) $\frac{4}{RC}$            (4) 4RC

Concept Questions :-

Spectral series
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Orbital acceleration of electron is

(1) $\frac{{n}^{2}{h}^{2}}{4{\mathrm{\pi }}^{2}{\mathrm{m}}^{2}{\mathrm{r}}^{3}}$                  (2) $\frac{{n}^{2}{h}^{2}}{4{n}^{2}{\mathrm{r}}^{3}}$

(3) $\frac{4{n}^{2}{h}^{2}}{{\mathrm{\pi }}^{2}{\mathrm{m}}^{2}{\mathrm{r}}^{3}}$                     (4) $\frac{4{n}^{2}{h}^{2}}{4{\mathrm{\pi }}^{2}{\mathrm{m}}^{2}{\mathrm{r}}^{3}}$

Concept Questions :-

Bohr's model of atom
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Consider the spectral line resulting from transition n = 2 to n = 1 in the atoms and ions given below.  The shorterst wavelength is given by

(1) Hydrogen atom

(2) Deuterium

(3) Singly ionised helium

(4) Doubly ionised lithium

Concept Questions :-

Spectral series
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The valence electron in alkali metal is a [1990]

(1) f-electron       (2) p-electron         (3) s-electron         (4) d-electron

Concept Questions :-

Various atomic model
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Light is a kind of wave. The wavelength of visible light ranges from about 4000 $\stackrel{\circ }{A}$ to 7000 $\stackrel{\circ }{A}$. Which of the following statements is false?

1. Ultraviolet light has a wavelength shorter than 4000 $\stackrel{\circ }{A}$

2. Infrared light has a wavelength longer than 7000 $\stackrel{\circ }{A}$

3. Red light has wavelength near about 7000 $\stackrel{\circ }{A}$

4. Violet light has wavelength near about 7000 $\stackrel{\circ }{A}$.

Concept Questions :-

Spectral series
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An $\alpha -$particle of energy 5 MeV is scattered through $180°$ by a fixed uranium nucleus. The distance of closest approach is of the order

(1)            (2)             (3)              (4)

Concept Questions :-

Various atomic model
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Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model:

(1) 13.6 eV             (2) 0.65 eV              (3) 1.9 eV              (4) 11.1 eV

Concept Questions :-

Bohr's model of atom
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Energy of an electron in an excited hydrogen atom is -3.4 eV. Its angular momentum will be (h = 6.626 $×$ 10-34 J-s)

1. 1.11 $×$ 1034 J s                   2. 1.51 $×$10-31 J s

3. 2.11 $×$ 10-34 J s                  4. 3.72 $×$ 10-34 J s

Concept Questions :-

Bohr's model of atom
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As per Bohr model, the minimum energy (in eV) required to remove the electron from the ground state of double ionized lithium (Z=3) is

(1) 1.51        (2) 13.6            (3) 40.8        (4) 122.4

Concept Questions :-

Bohr's model of atom