Structure of Atoms and Nuclei — Practice Quiz
Maharashtra Board · Class 12 · Physics
Try a 4-question quiz on Structure of Atoms and Nuclei for Maharashtra Board Class 12 Physics: tap an answer to check it and see why.
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Quick Quiz: Structure of Atoms and Nuclei
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According to Thomson's atomic model, what is the distribution of positive and negative charges in an atom?
In Rutherford's gold foil experiment, what percentage of alpha particles were deflected through angles larger than 90°?
Calculate the radius of the 2nd orbit of electron in hydrogen atom. (Given: Bohr radius a₀ = 0.053 nm)
What is the energy of electron in the ground state of hydrogen atom?
Sample Questions
Which of the following are postulates of Bohr's atomic model? (Select all correct answers)
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Electrons revolve around nucleus in circular orbits, Angular momentum is quantized: L = nh/2π, Energy is emitted when electron transitions from higher to lower orbit
Bohr's three postulates are: (1) Electrons revolve in circular orbits, (2) Angular momentum is quantized as L = nh/2π, and (3) Energy is emitted as photons during transitions between orbits. Electrons do NOT emit radiation continuously in stable orbits.
The wavelength formula for hydrogen spectrum is given by 1/λ = R(1/n² - 1/m²). For the Balmer series, what is the value of n?
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n = 2
For the Balmer series, n = 2. This series corresponds to electron transitions from higher energy levels (m = 3, 4, 5...) to the second energy level (n = 2). The Balmer series lies in the visible region of the electromagnetic spectrum.
A nucleus has mass number A = 56 and atomic number Z = 26. How many neutrons does it contain?
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30
Number of neutrons N = A - Z = 56 - 26 = 30. The mass number A represents the total number of nucleons (protons + neutrons), while Z represents the number of protons. This nucleus is iron-56.
Calculate the binding energy of a nucleus if the mass defect is 0.5 u. (Given: 1 u = 931.5 MeV/c²)
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465.75 MeV
Using Einstein's mass-energy relation: E = Δmc². Binding energy = 0.5 u × 931.5 MeV/u = 465.75 MeV. This is the energy required to separate all nucleons in the nucleus or the energy released when the nucleus is formed.
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