Download App

12. atoms — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics12. atoms1 Mark
MCQ
In a hydrogen like atom electron make transition from an energy level with quantum number $n$ to another with quantum number $(n- 1)$. If $n > >  1$, the frequency ofradiation emitted is proportional to
  • ✓
    $\frac{1}{{{n^3}}}$
  • B
    $\;\frac{1}{n}$
  • C
    $\;\frac{1}{{{n^2}}}$
  • D
    $\;\frac{1}{{{n^{\frac{3}{2}}}}}$
✓

Answer

Correct option: A.
$\frac{1}{{{n^3}}}$
a
$\frac{v}{x}=\frac{1}{\lambda}=R Z^{2}\left[\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right]$

$[\because n>>1]$

$v=R C Z^{2}\left[\frac{1}{(n-1)^{2}}-\frac{1}{n^{2}}\right]$

$\operatorname{RCZ}^{2}\left[\frac{2 n-1}{n^{2}(n-1)^{2}}\right]$

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 12. atoms→12. atoms — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Two plane mirrors. A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 30° at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is
→
Serious draw back of the semiconductor device is
→
The relation between the number of free electrons in semiconductors (n) and its temperature (T) is
→
In the truth table of the above circuit the value of $X$ and $\mathrm{Y}$ are
→
The temperature of an ideal gas in $3-$dimensions is $300\, {K}$. The corresponding de-Broglie wavelength of the electron approximately at $300\,{K}$, is $....\,nm$

$\left\lfloor{m}_{e}=\text { mass of electron }=9 \times 10^{-31} \,{kg}\right.$

${h}=\text { Planck constant }=6.6 \times 10^{-34} {Js}$

$\left.{k}_{{B}}=\text { Boltzmann constant }=1.38 \times 10^{-23}\, {JK}^{-1}\right]$

→
The material of wire of potentiometer is
→
In a given circuit as shown the two input waveform $A$ and $B$ are applied simultaneously. The resultant waveform $Y$ is
→
The charge flowing through a resistance $R$ varies with time according to $Q = at -bt^2.$ The total heat produced in $R$ is : (assume that direction of current not reversed)
→
Dark lines on solar spectrum are due to
→
By putting a magnetic substance of volume $30\, cm^3$ in a magnetising field of strength $\frac{1250}{\pi}$ $ampere/ metre$ the value of produced magnetic moment is $6\,A/m^2$ then calculate the value of magnetic induction produced in the substance .......$T$
→