CUET · PHYSICS · PYQ PAPER 2023
The radius of the inner most electron orbit of a hydrogen atom is 0.53 Å. What is the radius of orbit of \(2^{\text {nd }}\) excited state ?
- A 1.06 Å
- B 1.59 Å
- C 2.12 Å
- D 4.77 Å
Answer & Solution
Correct Answer
(D) 4.77 Å
Step-by-step Solution
Detailed explanation
\(r_n = n^2 r_1\) \(r_3 = 3^2 \times 0.53 \AA\) \(r_3 = 4.77 \AA\)
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
- Which of the following statement(s) is/are correct?
(A) The power of a lens is the ability of the lens to converge or diverge the incident rays.
(B) S.I unit of the power of a lens is dioptre while focal length is in centimetres
(C) For a lens of larger focal length, power is smaller
(D) In any combination of lenses, the power of combination is not algebraic addition of power of combined lenses
Choose the correct answer from the options given below:CUET 2025 Medium - Transverse wave nature of light is shown by which phenomenon?CUET 2025 Hard
- If the mass of a proton is \( m_p = 1.007825 \text{ u} \) and the mass of the neutron is \( m_n = 1.008665 \text{ u} \), the mass defect in the formation of \( {}_{3}^{7}\text{Li} \) nucleus is: (take the mass of Lithium nucleus as \( M_{Li} = 7.000000 \text{ u} \))CUET 2025 Easy
- In a Young's double slit experiment, a light of wavelength 550 nm is used to get fringes on screen 1.2 m away from the slits. The distance between the two slits is 1.5 mm. The fringe width isCUET 2025 Hard
- A thick long straight wire of radius 'a' is carrying steady current I. The current I is uniformly distributed across the cross-section. The ratio of magnetic fields at a distance a/2 and 3a/2 from the central axis of the wire isCUET 2025 Medium
- Identify the correct statements from the following in the context of electromagnetic waves.
(A) X-rays are not electromagnetic waves.
(B) Electromagnetic waves are transverse in nature.
(C) Electromagnetic waves can not be polarised.
(D) Electromagnetic waves travel with the speed of light in vacuum.
Choose the correct answer from the options given below:CUET 2025 Medium
More PYQs from CUET
- The points on the curve \(\frac{x^2}{9}+\frac{y^2}{16}=1\) at which the tangents are parallel to \(x\) - axis are:CUET 2023 Medium
- Match List I with List II
Choose the correct answer from the options given below:List - I (Organism) List - II (Product) (A) Streptococcus (I) Citric acid (B) Aspergillus niger (II) Streptokinase (C) Monascus purpureus (III) Ethanol (D) Saccharomyces cerevisiae (IV) Statin CUET 2023 Medium - The derivative of \((\log x)^x\) with respect to log \(x\) is:CUET 2025 Hard
- The semiconductor used for fabrication of visible LEDs must at least have a band gap of :CUET 2023 Easy
- Arrange the following in the decreasing order of basic strength in gas phase:
(A) \(C _2 H _5 NH _2\)
(B) \(\left( C _2 H _5\right)_2 NH\)
(C) \(\left( C _2 H _5\right)_3 N\)
(D) \(NH _3\)CUET 2025 Medium - The number of all possible matrices of order \(2 \times 3\) with entries \(-1\) or \(1\) is:CUET 2025 Medium