Class 12 Physics
CBSE and UP Board
Atoms
Chapter-12 Exercise 12.1
NCERT Solutions for Class 12 Physics Chapter 12 Question-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. (much greater than/no different from/much less than.) (b) In the ground state of ………. electrons are in stable equilibrium, while in ………. electrons always experience a net force. (Thomson’s model/ Rutherford’s model.) (c) A classical atom based on ………. is doomed to collapse. (Thomson’s model/ Rutherford’s model.) (d) An atom has a nearly continuous mass distribution in a ………. but has a highly non-uniform mass distribution in ………. (Thomson’s model/ Rutherford’s model.) (e) The positively charged part of the atom possesses most of the mass in ………. (Rutherford’s model/both the models.)
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Ans (a).
No different from
The sizes of the atoms taken in Thomson’s model and Rutherford’s model have the same order of magnitude.
Ans (b).
In the ground state of Thomson’s model, the electrons are in stable equilibrium.
However, in Rutherford’s model, the electrons always experience a net force.
Ans (c).
A classical atom based on Rutherford’s model is doomed to collapse.
Ans (d).
An atom has a nearly continuous mass distribution in Thomson’s model, but has a highly non-uniform mass distribution in Rutherford’s model.
Ans (e).
The positively charged part of the atom possesses most of the mass in both the models.