An electron jumps from the 4th orbit to the 2nd orbit of hydrogen atom. Given the Rydberg's constant R = . The frequency in Hz of the emitted radiation will be
(a) $\frac{3}{16}×{10}^{5}$           (b) $\frac{3}{16}×{10}^{15}$
(c) $\frac{9}{16}×{10}^{15}$          (d) $\frac{3}{4}×{10}^{15}$

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The ionisation potential of hydrogen atom is 13.6 volt. The energy required to remove an electron in the n = 2 state of the hydrogen atom is
(a) 27.2 eV                (b) 13.6 eV
(c) 6.8 eV                  (d) 3.4 eV

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If the wavelength of the first line of the Balmer series of hydrogen is 6561 $\stackrel{0}{\mathrm{A}}$, the wavelength of the second line of the series should be
(a) 13122 $\stackrel{0}{\mathrm{A}}$                  (b) 3280 $\stackrel{0}{\mathrm{A}}$
(c) 4860 $\stackrel{0}{\mathrm{A}}$                    (d) 2187 $\stackrel{0}{\mathrm{A}}$

Concept Questions :-

Spectral series
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Difficulty Level:

A beam of fast moving alpha particles were directed towards a thin film of gold. The parts A',B', and C' of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in

(a) B' will be minimum and in C' maximum
(b) A' will be maximum and in B' minimum
(c) A' will be minimum and in B' maximum
(d) C' will be minimum and in B' maximum

Concept Questions :-

Various atomic model
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Difficulty Level:

According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to
(a) ${\mathrm{Z}}^{2}{\mathrm{n}}^{2}$            (b) $\frac{{\mathrm{Z}}^{2}}{{\mathrm{n}}^{2}}$
(c) $\frac{{\mathrm{Z}}^{2}}{\mathrm{n}}$              (d) $\frac{{\mathrm{n}}^{2}}{\mathrm{Z}}$

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The radius of electron's second stationary orbit in Bohr's atom is R. The radius of the third orbit will be

(a) 3 R                    (b) 2.25 R
(c) 9 R                    (d) $\frac{\mathrm{R}}{3}$

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr's first postulate, the kinetic energy $\mathrm{K}=\frac{1}{2}{\mathrm{mv}}^{2}$ of the electron in C.G.S. system is equal to

(a) $\frac{1}{2}\frac{{\mathrm{Ze}}^{2}}{\mathrm{r}}$                             (b) $\frac{1}{2}\frac{{\mathrm{Ze}}^{2}}{{\mathrm{r}}^{2}}$
(c) $\frac{{\mathrm{Ze}}^{2}}{\mathrm{r}}$                                 (d) $\frac{{\mathrm{Ze}}^{2}}{{\mathrm{r}}^{2}}$

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is
(a) 1/2                    (b) 2
(c) $-1/2$                (d) – 2

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The spectral series of the hydrogen spectrum that lies in the ultraviolet region is the

(a) Balmer series                 (b) Pfund series
(c) Paschen series                (d) Lyman series

Concept Questions :-

Spectral series
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Difficulty Level:

Figure shows the energy levels P, Q, R, S and G of an atom where G is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from Q to S. A blue line can be obtained by following energy level change

(a) P to Q (b) Q to R
(c) R to S (d) R to G

Concept Questions :-

Spectral series