NCERT Solutions for Class 12th Physics Chapter 12 –Atoms

NCERT Solutions for Class 12th Physics Chapter 12 – AtomsNational Council of Educational Research and Training (NCERT) Book Solutions for class 12thSubject: PhysicsChapter: Chapter 12 – Atoms

Class 12th Physics Chapter 12 AtomsNCERT Solution is given below.

Question 12.1: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 differentfrom/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 nonuniformmass 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.)Answer(a) The sizes of the atoms taken in Thomson’s model and Rutherford’s model have the same order of magnitude.(b) In the ground state of Thomson’s model, the electrons are in stable equilibrium. However, in Rutherford’s model, theelectrons always experience a net force.(c) A classical atom based on Rutherford’s model is doomed to collapse.(d) An atom has a nearly continuous mass distribution in Thomson’s model, but has a highly non-uniform mass distribution inRutherford’s model.(e) The positively charged part of the atom possesses most of the mass in both the models.

October 11, 2013 | Filed under: 12th Class,Book Solutions,Physics | Posted by: Anand Meena

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