MCQ
The Rydberg constant $R$ for hydrogen is
  • A
    $R = - \left( {\frac{1}{{4\pi {\varepsilon _0}}}} \right).\frac{{2{\pi ^2}m{e^2}}}{{c{h^2}}}$
  • B
    $R = \left( {\frac{1}{{4\pi {\varepsilon _0}}}} \right).\frac{{2{\pi ^2}m{e^4}}}{{c{h^2}}}$
  • C
    $R = {\left( {\frac{1}{{4\pi {\varepsilon _0}}}} \right)^2}.\frac{{2{\pi ^2}m{e^4}}}{{{c^2}{h^2}}}$
  • $R = {\left( {\frac{1}{{4\pi {\varepsilon _0}}}} \right)^2}.\frac{{2{\pi ^2}m{e^4}}}{{c{h^3}}}$

Answer

Correct option: D.
$R = {\left( {\frac{1}{{4\pi {\varepsilon _0}}}} \right)^2}.\frac{{2{\pi ^2}m{e^4}}}{{c{h^3}}}$
d
(d)$R = \frac{{2{\pi ^2}{k^2}{e^4}m}}{{c{h^3}}} = {\left( {\frac{1}{{4\pi {\varepsilon _0}}}} \right)^2}\frac{{2{\pi ^2}m{e^4}}}{{c{h^3}}}$

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

Three identical spherical shells, each of mass $m$ and radius $r$ are placed as shown in figure. Consider an axis $XX'$ which is touching to two shells and passing through diameter of third shell. Moment of inertia of the system consisting of these three spherical shells about $XX'$ axis is
The atomic mass of ${ }_6 \mathrm{C}^{12}$ is $12.000000\ \mathrm{u}$ and that of ${ }_6 \mathrm{C}^{13}$ is $13.003354 \ \mathrm{u}$. The required energy to remove a neutron from ${ }_6 \mathrm{C}^{13}$, if mass of neutron is $1.008665 \ \mathrm{u}$, will be :
The power of sound from the speaker of a radio is $20$ milli watt by turning the knob of the  volume control the power of the sound is increased to $400$ milli watt. The power  increase in decibles as compared to the original power is ..... $dB$
The radius of the first (lowest) orbit of the hydrogen atom is ${a_0}.$ The radius of the second (next higher) orbit will be
In Young’s experiment, the ratio of maximum to minimum intensities of the fringe system is $4 : 1$. The amplitudes of the coherent sources are in the ratio
An open organ pipe of length $L$ vibrates in second harmonic mode. The pressure vibration is maximum
A $160 \,W$ light source is radiating light of wavelength $6200 \,\mathring A$ uniformly in all directions. The photon flux at a distance of $1.8 \,m$ is of the order of .......... $m ^{-2} s ^{-1}$ (Planck's constant $\left.=6.63 \times 10^{-34} \,J - s \right)$
An inductor of $0.5\,mH$, a capacitor of $20\,\mu\,F$ and resistance of $20\,\Omega$ are connected in series with a $220\,V$ ac source. If the current is in phase with the emf, the amplitude of current of the circuit is $\sqrt{x} A$. The value of $x$ is -
Two periodic waves of intensities $I_1$ and $I_2$ pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is
When a point source of light is at a distance of one metre from a photo cell, the cut off voltage is found to be $V$. If the same source is placed at $ 2$ m distance from photo cell, the cut off voltage will be