The expression for Bohr's radius of an atom is - Vidyadip

MCQ

The expression for Bohr's radius of an atom is

A
$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}m{e^4}{z^2}}}$
✓
$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}m{e^2}z}}$
C
$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}m{e^2}{z^2}}}$
D
$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}{m^2}{e^2}{z^2}}}$

✓

Answer

Correct option: B.

$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}m{e^2}z}}$

b
It’s Obvious

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 2. structure of atom→2. structure of atom — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

In Duma's method for estimation of nitrogen, $0.25\,g$ of an organic compound gave $40\,mL$ of nitrogen collected at $300\,K$ temperature and $725\,mm$ pressure. If the aqueous tension at $300\,K$ is $25\,mm$ , the percentage of nitrogen in the compound is

Number of electrons surroundings Kr in KrF₂ is:

Consider the following statements Of these statements

$(I)\,C{H_3}O\mathop C\limits^ \oplus {H_2}$ is more stable than $C{H_3}\mathop C\limits^ \oplus {H_2}$

$(II)\,M{e_2}\mathop C\limits^ \oplus H$ is more stable than $C{H_3}C{H_2}\mathop C\limits^ \oplus {H_2}$

$(III)\,C{H_2} = CH - \mathop C\limits^ \oplus {H_2}$ is more stable than $C{H_3}C{H_2}\mathop C\limits^ \oplus {H_2}$

$(IV)\,C{H_2} = \mathop C\limits^ \oplus H$ is more stable than $C{H_3}\mathop C\limits^ \oplus {H_2}$

In the following sequence of reactions the maximum number of atoms present in molecule '$C$' in one plane is

$A \xrightarrow[ { Cu\; tube }]{\text { Redhot }}\mathrm{B} \xrightarrow[ Anhydrous AlCl_3]{\mathrm{CH}_{3} \mathrm{Cl}(1 \mathrm{eq}} \mathrm{C}$

($A$ is a lowest molecular weight alkyne)

Arrange the $(C - H)$ bonds $x, y$ and $z$ in decreasing order of their bond dissociation energies in homolysis.

Total planes in $CH_4$ which contains maximum number of atoms?

The element $Z= 114$ has been discovered recently. It will belong to which of the following family/group and electronic configuration?

A buffer solution is a solution whose pH value on keeping in the air:

Total number of secondary amines (Excluding stereo isomer) possible with the molecular formula $C_5H_{13}N$ is

Which one of the following is not a buffer solution