MCQ
The ratio between Bohr radii is:
  • A
    $1 : 2 : 3$
  • B
    $2 : 4 : 6$
  • $1 : 4 : 9$
  • D
    $1 : 3 : 5$

Answer

Correct option: C.
$1 : 4 : 9$

$1 : 4 : 9$, In Bohr’s atomic model, $r_n n^2$

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

Similar questions

A wire of resitance $R$ and length $L$ is cut into $5$ equal part. if these parts are joined parts are joined paralley, than result resistance will be:
Electroscope is used:
The peak value of an alternating e.m.f. E is given by $E = {E_0}\cos \omega \,t$ is $10\, volts$ and its frequency is $50\; Hz$. At time$t = \frac{1}{{600}}\;sec$, the instantaneous e.m.f. is
When the current through a solenoid increases at a constant rate, the induced current
A uniform magnetic field B is acting from south to north and is of magnitude 1.5 wb/m$^2$. If a proton having mass = $1.7 \times 10^{-19}$ kg and charge = $1.6 \times 10^{-19}$ C moves in this field vertically downwards with energy 5 MeV, then the force acting on it will be
The decay constant of a radio active substance is $0.173\, (years)^{-1}.$ Therefore :
The horizontal component of earth's magnetic field at a certain place is $3 \times 10^{-5}\,T$ and direction of the field is from geographic south to geographic north. A very long straigh conductor is carrying steady current of $1\,A$ then calculate the force per unit length on it if the direction of current is from east to west (In $N/m$ )
In a region, electric field varies as $E = 2x^2 -4$ where $x$ is the distance in metre from origin along $x-$ axis. A positive charge of $1\,\mu C$ is released with minimum velocity from infinity for crossing the origin, then
Given below are two statements : One is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$ : $n - p - n$ transistor permits more current than a $p-n-p$ transistor

Reason $R$ : Electrons have greater mobility as a charge carrier

Choose the correct answer from the options given below

$A B C$ is a right angled triangle situated in a uniform electric field $\vec{E}$ which is in the plane of the triangle. The points $A$ and $B$ are at the same potential of $15 \,V$ while the point $C$ is at a potential of $20 \,V . A B=3 \,cm$ and $B C=4 \,cm$. The magnitude of electric field is (in $S.I.$ Units)