Download App

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

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 12. atoms4 Marks
Question
The wavelength of the radiation emitted is $\lambda_0$ when an electron jumps from the second excited state to the first excited state of hydrogen atom. If the electron jumps from the third excited state to the second orbit of the hydrogen atom, the wavelength of the radiation emitted will be $\frac{20}{x} \lambda_0$. The value of $x$ is $........$
✓

Answer

Second excited state $\rightarrow$ first excited state

$n =3 \rightarrow n =2$

$\frac{ hc }{\lambda_0}=13.6\left(\frac{1}{2^2}-\frac{1}{3^2}\right) \ldots \ldots \text { (i) }$

Third excited state $\rightarrow$ second orbit

$n =4 \rightarrow n =2$

$\frac{ hc }{\left(20 \lambda_0 / x \right)}=13.6\left(\frac{1}{2^2}-\frac{1}{4^2}\right) \text {. }$

$(ii)$ $\div$ $(i)$

$\frac{x}{20}=\frac{\frac{1}{2^2}-\frac{1}{4^2}}{\frac{1}{2^2}-\frac{1}{3^2}}$

$x=27$

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

Fly-wheel is used with an engine because it
→
Stress to strain ratio is equivalent to
→
The figure here gives the electric field of an $EM$ wave at a certain point and a certain instant. The wave is transporting energy in the negative $z$ direction. What is the direction of the magnetic field of the wave at that point and instant
→
The graph below shows the velocity versus time graph for a body.

Which of the following graphs represents the corresponding acceleration $v/s$ time graph ?

→
An electric dipole with dipole moment $4 \times 10^{-9} \;C \,m$ is aligned at $30^{\circ}$ with the direction of a uniform electric field of magnitude $5 \times 10^{4} \;N\,C ^{-1}$ Calculate the magnitude of the torque acting on the dipole.
→
In the Arctic region, hemispherical houses called Igloos are made of ice. It is possible to maintain a temperature inside an Igloo as high as $20^{\circ} C$ because
→
Bohr's atom model assumes
→
When heat $Q$ is supplied to a diatomic gas of rigid molecules at constant volume its temperature increases by $\Delta T.$ The heat required to produce the same change in temperature, at constant pressure is
→
If $Y, K$ and $\eta$ are the values of Young's modulus, bulk modulus and modulus of rigidity of any material respectively. Choose the correct relation for these parameters.
→
The values of a number of quantities are used in a mathematical formula. The quantity that should be most precise and accurate in measurement is the one
→