If an electron in hydrogen atom jumps from third orbit to second … - Vidyadip

MCQ

If an electron in hydrogen atom jumps from third orbit to second orbit, the frequency of the emitted radiation is given by ( $c$ is speed of light)

A
$\frac{3 R c}{29}$
✓
$\frac{5 R c}{36}$
C
$\frac{7 R c}{36}$
D
$\frac{8 R c}{31}$

✓

Answer

Correct option: B.

$\frac{5 R c}{36}$

b
(b)

$\frac{1}{\lambda}=R\left(\frac{1}{2^2}-\frac{1}{3^2}\right)$

$f=R_0 c\left(\frac{1}{4}-\frac{1}{9}\right)$

$f=\frac{R c 5}{36}=\frac{5 R c}{36}$

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

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A metallic rod of cross-sectional area $9.0\,\,cm^2$ and length $0.54 \,\,m$, with the surface insulated to prevent heat loss, has one end immersed in boiling water and the other in ice-water mixture. The heat conducted through the rod melts the ice at the rate of $1 \,\,gm$ for every $33 \,\,sec$. The thermal conductivity of the rod is ....... $ Wm^{-1} K^{-1}$

A proton and an electron have the same de Broglie wavelength. If $K_p$ and $K_e$ be the kinetic energies of proton and electron respectively. Then choose the correct relation :

The amplitude of wave disturbance propagating in the positive $x$-direction is given by $y=\frac{1}{(1+x)^{2}}$ at time $t=0$ and $y=\frac{1}{1+(x-2)^{2}}$ at $t=1$ s, where $x$ and $y$ are in metres. The shape of wave does not change during the propagation. The velocity of the wave will be $...\,{m} / {s}.$

Five identical cells each of internal resistance $1\, \Omega$ and $emf \;5\, {V}$ are connected in series and in parallel with an external resistance $'R'.$ For what value of $'R',$ current in series and parallel combination will remain the same ? (in $\Omega$)

Assertion : If the current in a solenoid is reversed in direction while keeping the same magnitude, the magnetic field energy stored in the solenoid decreases.

Reason : Magnetic field energy density is proportional to square of current.

The amplitude of magnetic field in an electromagnetic wave propagating along $y$-axis is $6.0 \times 10^{-7}\,T$. The maximum value of electric field in the electromagnetic wave is:

An infinite line charge produce a field of $7.182 \times {10^8}\,N/C$ at a distance of $2\, cm$. The linear charge density is

Take the mean distance of the moon and the sun from the earth to be $0.4 \times 10^6\,km$ and $150 \times 10^6\,km$ respectively. Their masses are $8 \times 10^{22}\, kg$ and $2 \times 10^{30}\, kg$ respectively. The radius of the earth is $6400\, km$. Let $\Delta {F_1}$ be the difference in the forces exerted by the moon at the nearest and farthest points on the earth and $\Delta {F_2}$ be the difference in the force exerted by the sun at the nearest and farthest points on the earth. Then, the number closest to $\frac{{\Delta {F_1}}}{{\Delta {F_2}}}$ is

A solid sphere of mass $M,$ radius $R$ and having moment of inertia about an axis passing through the centre of mass as $I$, is recast into a disc of thickness $t$, whose moment of inertia about an axis passing through its edge and perpendicular to its plane remains $I$. Then, radius of the disc will be

The angular speed of a body changes from ${\omega _1}$ to ${\omega _2}$ without applying a torque but due to changes in moment of inertia. The ratio of radii of gyration in two cases is