Which of the following spectral series in hydrogen atom give spectral line of 4860 Å
(a) Lyman               (b) Balmer
(c) Paschen             (d) Brackett

Concept Questions :-

Spectral series

Difficulty Level:

When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h = 6.6)

(a)                (b)
(c)                (d)

Concept Questions :-

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

Difficulty Level:

The concept of stationary orbits was proposed by

(a) Neil Bohr              (b) J.J. Thomson
(c) Ruther ford           (d) I. Newton

Concept Questions :-

Various atomic model

Difficulty Level:

What will be the angular momentum of a electron, if energy of this electron in H-atom is 1.5eV (in J-sec)
(a) $1.05×{10}^{-34}$           (b) $2.1×{10}^{-34}$
(c) $3.15×{10}^{-34}$           (d)  $-2.1×{10}^{-34}$

Concept Questions :-

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

Difficulty Level:

Who discovered spin quantum number
(a) Unlenbeck and Goudsmit
(b) Nell’s Bohr
(c) Zeeman
(d) Sommerfield

Concept Questions :-

Various atomic model

Difficulty Level:

The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to

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

Concept Questions :-

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

Difficulty Level:

In Bohr’s model, if the atomic radius of the first orbit is ${\mathrm{r}}_{0}$, then the radius of the fourth orbit is
(a) ${\mathrm{r}}_{0}$              (b) 4${\mathrm{r}}_{0}$
(c) ${\mathrm{r}}_{0}$/16          (d) 16${\mathrm{r}}_{0}$

Concept Questions :-

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

Difficulty Level:

If R is the Rydberg’s constant for hydrogen the wave number of the first line in the Lyman series will be

(a) $\frac{\mathrm{R}}{4}$                   (b) $\frac{3\mathrm{R}}{4}$
(c) $\frac{\mathrm{R}}{2}$                   (d) 2R

Concept Questions :-

Spectral series
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Difficulty Level:

In hydrogen atom, if the difference in the energy of the electron in n =2 and n = 3 orbits is E, the ionization energy of hydrogen atom is
(a) 13.2 E                (b) 7.2 E
(c) 5.6 E                  (d) 3.2 E

Concept Questions :-

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

Difficulty Level:

The first member of the Paschen series in hydrogen spectrum is of wavelength 18,800 Å. The short wavelengths limit of Paschen series is
(a) 1215 Å     (b) 6560 Å
(c) 8225 Å     (d) 12850 Å

Concept Questions :-

Spectral series