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CBSE - Class 12 > Physics > Atoms Worksheets

Free CBSE - Class 12 Physics - Atoms worksheets

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1.
Choose the correct alternative from the clues given at the end of the each statement:
(a) The size of the atom in Thomson’s model is .......... the atomic size in Rutherford’s model.
1. much greater than 2. no different from 3. much less than
2.
Choose the correct alternative from the clues given at the end of the each statement:
(b) In the ground state of .......... electrons are in stable equilibrium, while in .......... electrons always experience a net force.
1. Thomson’s model 2. Rutherford’s model
3.
Choose the correct alternative from the clues given at the end of the each statement:
(c) A classical atom based on .......... is doomed to collapse.
1. Thomson’s model 2. Rutherford’s model
4.
Choose the correct alternative from the clues given at the end of the each statement:
(d) An atom has a nearly continuous mass distribution in a .......... but has a highly non-uniform mass distribution in ..........
1. Thomson’s model 2. Rutherford’s model
5.
Choose the correct alternative from the clues given at the end of the each statement:
(e) The positively charged part of the atom possesses most of the mass in ..........
1. Rutherford’s model 2. both the models
6.
Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?
7.
A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?
8.
The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?
9.
A hydrogen atom initially in the ground level absorbs a photon, which excites it to the $n = 4$ level. Determine the wavelength and frequency of photon.
10.
(a) Using the Bohr’s model calculate the speed of the electron in a hydrogen atom in the $n = 1, 2$, and $3$ levels.
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