JEE Mains · Physics · STD 12 - 12. atoms
As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom/ion:
- A kinetic energy, potential energy and total energy decrease
- B kinetic energy decreases, potential energy increases but total energy remains same
- C kinetic energy and total energy decrease but potential energy mcreases
- D its kinetic energy increases but potential energy and total energy decrease
Answer & Solution
Correct Answer
(D) its kinetic energy increases but potential energy and total energy decrease
Step-by-step Solution
Detailed explanation
\({\text{U}} = - {\text{K}}\frac{{{\text{z}}{{\text{e}}^2}}}{{\text{r}}}\) ; \({\text{T}} \cdot {\text{E}} = - \frac{{\text{k}}}{2}\frac{{{\text{z}}{{\text{e}}^2}}}{{\text{r}}}\) \(\mathrm{K.E}=\frac{\mathrm{k}}{2} \frac{\mathrm{ze}^{2}}{\mathrm{r}} .\) Here \(r\) decreases
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
- Two coils have mutual inductance \(0.002 \ \mathrm{H}\). The current changes in the first coil according to the relation \(\mathrm{i}=\mathrm{i}_0 \sin \omega \mathrm{t}\), where \(\mathrm{i}_0=5 \mathrm{~A}\) and \(\omega=50 \pi\) \(\mathrm{rad} / \mathrm{s}\). The maximum value of \(\mathrm{emf}\) in the second coil is \(\frac{\pi}{\alpha} \mathrm{V}\). The value of \(\alpha\) is_______.JEE Mains 2024 Hard
- A plane electromagnetic wave in a non-magnetic dielectric medium is given by \(\vec E\, = \,{\vec E_0}\,(4 \times {10^{ - 7}}\,x - 50t)\) with distance being in meter and time in seconds. The dielectric constant of the medium isJEE Mains 2013 Hard
- A particle of mass \(\mathrm{m}\) is projected with a speed \(u\) from the ground at an angle \(\theta=\frac{\pi}{3}\) w.r.t. horizontal (\(x-\)axis). When it has reached its maximum height, it collides completely inelastically with another particle of the same mass and velocity \(u \hat i\). The horizontal distance covered by the combined mass before reaching the ground isJEE Mains 2020 Hard
- Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in same time for parallel to series will be:JEE Mains 2023 Medium
- Two capacitors having capacitance \(C _{1}\) and \(C _{2}\) respectively are connected as shown in figure. Initially, capacitor \(C _{1}\) is charged to a potential difference \(V\) volt by a battery. The battery is then removed and the charged capacitor \(C_{1}\) is now connected to uncharged capacitor \(C _{2}\) by closing the switch \(S\). The amount of charge on the capacitor \(C _{2}\), after equilibrium is
JEE Mains 2022 Medium - Consider a completely full cylindrical water tank of height 1.6 m and cross-sectional area \(0.5 \mathrm{~m}^2\). It has a small hole in its side at a height 90 cm from the bottom. Assume, the cross-sectional area of the hole to be negligibly small as compared to that of the water tank. If a load 50 kg is applied at the top surface of the water in the tank then the velocity of the water coming out at the instant when the hole is opened is : \(\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2\right)\)JEE Mains 2025 Hard
More PYQs from JEE Mains
- If \(a_n=\frac{-2}{4 n^2-16 n+15}\), then \(a_1+a_2+\ldots \ldots+a_{25}\) is equal to :JEE Mains 2023 Hard
- The number of words (with or without meaning) that can be formed from all the letters of the word \("LETTER"\) in which vowels never come together isJEE Mains 2020 Medium
- Let \(A=\left\{X=(x, y, z)^{T}: P X=0\right.\) and \(\left.\mathrm{x}^{2}+\mathrm{y}^{2}+\mathrm{z}^{2}=1\right\}\) where \(\mathrm{P}=\left[\begin{array}{ccc}1 & 2 & 1 \\ -2 & 3 & -4 \\ 1 & 9 & -1\end{array}\right]\) then the set \(\mathrm{A}\)JEE Mains 2020 Hard
- A simple pendulum of string length 30 cm performs 20 oscillations in 10s. The length of the string required for the pendulum to perform 40 oscillations in the same time duration is ___________ cm. [Assume that the mass of the pendulum remains same.]JEE Mains 2026 Easy
- A rod of length \(50\,cm\) is pivoted at one end. It is raised such that if makes an angle of \(30^o\) fro the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in \(rad\,s^{-1}\) ) will be \((g = 10\,ms^{-2})\)
JEE Mains 2019 Medium - Let the line \(L\) pass through the point \((0,1,2)\), intersect the line \(\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}\) and be parallel to the plane \(2 x+y-3 z=4\). Then the distance of the point \(P(1,-9,2)\) from the line \(L\) isJEE Mains 2023 Hard