WBJEE · Physics · Atomic Physics
If \(\mathrm{R}\) is the Rydberg Constant in \(\mathrm{cm}^{-1}\), then hydrogen atom does not emit any radiation of wave-length in the range of
- A \(\frac{1}{\mathrm{R}}\) to \(\frac{4}{3 \mathrm{R}} \mathrm{cm}\)
- B \(\frac{7}{5 \mathrm{R}}\) to \(\frac{19}{5 \mathrm{R}} \mathrm{cm}\)
- C \(\frac{4}{\mathrm{R}}\) to \(\frac{36}{5 \mathrm{R}} \mathrm{cm}\)
- D \(\frac{9}{\mathrm{R}}\) to \(\frac{144}{7 \mathrm{R}} \mathrm{cm}\)
Answer & Solution
Correct Answer
(B) \(\frac{7}{5 \mathrm{R}}\) to \(\frac{19}{5 \mathrm{R}} \mathrm{cm}\)
Step-by-step Solution
Detailed explanation
Hint: \(\frac{1}{\lambda}=\mathrm{R}\left[\frac{1}{\mathrm{n}_{\mathrm{f}^{2}}}-\frac{1}{\mathrm{n}_{\mathrm{i}^{2}}}\right]\) For range of wavelengths:\(\mathrm{n}_{\mathrm{i}}=1,2,3, \ldots . .\) for Lyman, Balmer, Paschen, \(\ldots \ldots\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A light charged particle is revolving in a circle of radius \(r\) in electrostatic attraction of a static heavy particle with opposite charge How does the magnetic field vary at the centre of the circle due to the moving charge depend on \(r ?\)WBJEE 2018 Medium
-
A small ball of mass \(m\) is suspended from the ceiling of a floor by a string of length \(L\). The ball moves along a horizontal circle with constant angular velocity \(\omega\), as shown in the figure. The torque about the centre ( O ) of the horizontal circle isWBJEE 2024 Medium - If the Earth were to suddenly contract to \(\frac{1}{n}\) th of its present radius without any change in its mass, the duration of the new day will be nearlyWBJEE 2011 Hard
- A body floats with \(\frac{1}{\mathrm{n}}\) of its volume keeping outside of water. If the body has been taken to height h inside water and released, it will come to the surface after time t. ThenWBJEE 2024 Medium
- If \(n\) denotes a positive integer, \(h\) the Planck constant, \(q\) the charge and \(B\) the magnetic field, then the quantity \(\left[\frac{n h}{2 \pi q B}\right]\) has theWBJEE 2014 Easy
- A block of mass m rests on a horizontal table with a co-efficient of static friction \(\mu .\) What minimum force must be applied on the block to drag it on the table?WBJEE 2020 Hard
More PYQs from WBJEE
- 2 gm of metal carbonate is neutralized completely by \(100 \mathrm{ml}\) of \(0.1(\mathrm{~N}) \mathrm{HCl}\). The equivalent weight of metal carbonate isWBJEE 2011 Medium
- The equation \(6^{x}+8^{x}=10^{x}\) hasWBJEE 2021 Medium
- The line joining \(A(b \cos \alpha, b \sin \alpha)\)
and
\(B(a \cos \beta, a \sin \beta),\) where \(a \neq b,\) is produced to the
point \(M(x, y)\) so that \(A M: M B=b: a\). Then, \(x \cos \frac{\alpha+\beta}{2}+y \sin \frac{\alpha+\beta}{2}\) is equal toWBJEE 2012 Easy - Let \(A\) and \(B\) be two non-singular skew symmetric matrices such that \(A B=B A\), then \(A^{2} B^{2}\left(A^{\top} B\right)^{-1}\left(A B^{-1}\right)^{\top}\) is equal toWBJEE 2021 Hard
- The value of \(\left(\frac{1}{\log _3 12}+\frac{1}{\log _4 12}\right)\) isWBJEE 2009 Easy
- A unit vector in \(X Y\)-plane making an angle \(45^{\circ}\) with \(\hat{i}+\hat{j}\) and an angle \(60^{\circ}\) with \(3 \hat{i}-4 \hat{j}\) isWBJEE 2024 Easy