COMEDK · Physics · 28. Atomic Physics
The electron in a hydrogen atom makes a transition from \(n=n_{1}\) to \(n=n_{2}\) state. The time period of the electron in the initial state \(n_{1}\) is eight times that in the final state \(n_{2}\). The possible values of \(n_{1}\) and \(n_{2}\) are
- A \(n_{1}=8, n_{2}=1\)
- B \(n_{1}=4, n_{2}=2\)
- C \(n_{1}=2, n_{2}=4\)
- D \(n_{1}=1, n_{2}=8\)
Answer & Solution
Correct Answer
(B) \(n_{1}=4, n_{2}=2\)
Step-by-step Solution
Detailed explanation
Here, for hydrogen atom, \(Z=1\) We know that, time period of electron in \(n\)th orbit is given as \(\begin{aligned} T_{n} & \propto n^{3} \\ \therefore \quad & \frac{T_{n_{1}}}{T_{n_{2}}}=\frac{n_{1}^{3}}{n_{2}^{3}} \end{aligned}\) Since, \(\quad T_{n_{1}}=8 T_{n_{2}}\)…
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
- When a beam of 10.6 eV photons of intensity \(2.0 \mathrm{~W} / \mathrm{m}^2\) falls on a platinum surface of area \(1.0 \times 10^{-4} \mathrm{~m}^2\) and work function 5.6 eV . \(0.53 \%\) of the incident photons eject photoelectrons. The number of photoelectrons emitted per second isCOMEDK 2024 Hard
- A disc of moment of inertia \(4 \mathrm{~kg}-\mathrm{m}^2\) revolving with \(16 \mathrm{rad} / \mathrm{s}\) is placed on another disc of moment of inertia \(8 \mathrm{Kg}-\mathrm{m}^2\) revolving \(4 \mathrm{rad} / \mathrm{s}\). The angular frequency of composite discCOMEDK 2022 Easy
- Two identieal metal spheres charged with \(+12 \mu \mathrm{F}\) and \(-8 \mu \mathrm{F}\) are kept at certain distance in air. They are brought into contact and then kept at the same distance. The ratio of the magnitudes of electrostatic forces between them before and after contact isCOMEDK 2018 Easy
- In Young's double slit interference experiment, using two coherent waves of different amplitudes, the intensities ratio between bright and dark fringes is 3 . Then, the value of the ratio of the amplitudes of the wave that arrive there isCOMEDK 2023 Medium
- With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is \(\dfrac{2}{3}\) of the weight?COMEDK 2022 Easy
- Four masses each 2 kg are placed at the corners A, B, C, D of a mass less square frame. 40 kg mass is at the centre O of a square frame of side 0.2m. It is to be rotated about an axis passing through the centre O and perpendicular to the plane of the frame. Calculate the torque in N-m required to produce an angular acceleration of \(\dfrac{\pi}{2}\ rads^{-2}\).COMEDK 2026 Medium
More PYQs from COMEDK
- Light of wavelength \(\lambda\) shines on a metal surface with intensity \(x\) and the metal emits \(Y\) electrons per second of average energy \(Z\). What will happen to \(Y\) and \(Z\) if \(x\) is doubled?COMEDK 2024 Medium
- A square wire of each side \(l\) carries a current \(I\). The magnetic field at the mid-point of the square
COMEDK 2023 Easy - Identify the correct order of the type of reactions taking place in this sequence:
COMEDK 2026 Medium - The maximum current that can be measured by a galvanometer of resistance \(40 \Omega\) is \(10 \mathrm{~mA}\). It is converted into a voltmeter that can read upto \(50 \mathrm{~V}\). The resistance to be connected in series with the galvanometer (in ohm) isCOMEDK 2019 Medium
- If \(a\) and \(b\) are vectors such that \(|a \times b|=|a-b|\), then the angle between a and b isCOMEDK 2020 Easy
- If a liquid does not wet glass, its angle of contact isCOMEDK 2017 Medium