Download App

STD 12 - 12. atoms — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 12. atoms4 Marks
MCQ
A hydrogen atom (ionisation potential $ 13.6\, eV$) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is.......$eV$
  • A
    $1.89$
  • ✓
    $2.55$
  • C
    $12.09 $
  • D
    $12.75$
✓

Answer

Correct option: B.
$2.55$
b
(b) Energy released$ = 13.6\left[ {\frac{1}{{{{(2)}^2}}} - \frac{1}{{{{(4)}^2}}}} \right] = 2.55\,eV$

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

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

Similar questions

An unknown nucleus collides with a ${}^4He$ nucleus, and after the collision the two nuclei travel in perpendicular directions relative to each other. If kinetic energy is lost in the collision, the unknown nucleus must be 
→
When a body moves in a circular path, no work is done by the force since
→
In an $ac$ circuit $I = 100\, sin \,200$ $\pi t.$ The time required for the current to achieve its peak value will be
→
If the total energy transferred to a surface in time t is $6.48 \times 10^5 J$, then the magnitude of the total momentum delivered to this surface for complete absorption will be :
→
An air bubble of $1\, cm$ radius is rising at a steady rate of $2.00\, mm/sec$ through a liquid of density $1.5\, gm$ per $cm^3$. Neglect density of air. If $g$ is $1000\, cm/sec^2$, then the coefficient of viscosity of the liquid is
→
As a body performs $S.H.M.$, its potential energy $U.$ varies with time as indicated in
→
Match list-I with list-II :
 List-I List-II
(A)Kinetic energy of planet(I)$-\frac{ GMm }{ a }$
(B)Gravitation Potential energy of Sun-planet system.(II)$\frac{ GMm }{2 a }$
(C)Total mechanical energy of planet(III)$\frac{ Gm }{ r }$
(D)Escape energy at the surface of planet for unit mass object(IV)$-\frac{ GMm }{2 a }$
(Where a = radius of planet orbit, r = radius of 
planet, M = mass of Sun, m = mass of planet) 
→
Assuming the earth to be a sphere of uniform mass density, the weight of a body at a depth $d=\frac{R}{2}$ from the surface of earth, if its werght on the surface of earth is $200\,N$, will be $...........\,N$ ( $Given R =$ Radrus of earth)
→
On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam
→
A simple harmonic oscillator has a period of $0.01 \,sec$ and an amplitude of $0.2\, m$. The magnitude of the velocity in $m{\sec ^{ - 1}}$ at the centre of oscillation is
→