NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom| Download in PDF

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom| Download in PDF

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom| Download in PDF

CBSE Class 11 Solved Paper N

NCERT books supply a quantity of issues in the type of train questions for college students to unravel which helps them assess their understanding of the subjects realized in the chapter. Fixing these train questions in every chapter assures constructive outcomes as these questions are typically requested in exams immediately or in a twisted method. Subsequently, college students who wish to rating effectively in their CBSE exams ought to follow NCERT questions.(*9*)

Right here we’ve collated the NCERT options for CBSE Class 9 Science Chapter 4 – Structure of the Atom. Right here, college students can discover a higher strategy to the questions given at the finish of the chapter- Structure of the Atom. All these options have been ready by the topic consultants and have been revised to convey correct examine materials for our college students.(*9*)

Some of the questions and their options from NCERT Solutions for Class 9 Science Chapter 4 – Structure of the Atom are as follows:(*4*)(*9*)

Q.(*4*) What are canal rays?(*9*)

Sol.(*4*)(*9*)

Canal rays or anode rays are the positively charged rays that are seen shifting from the anode in direction of cathode in a specifically designed discharge tube (with a porous cathode), when a excessive voltage is utilized throughout the electrodes. These rays have been found by Goldstein in 1886.(*9*)

Q.(*4*) On the foundation of Thomson’s mannequin of an atom, clarify how the atom is impartial as an entire?(*9*)

Sol.(*4*)(*9*)

In keeping with Thomson’s mannequin of the atom, an atom consists of each negatively and positively charged particles. The negatively charged particles are embedded in the positively charged sphere These unfavorable and constructive fees are equal in magnitude. Thus, by counterbalancing one another’s impact, they make an atom impartial.(*9*)

Q.(*4*) What do you assume could be the commentary if the α-particle scattering experiment is carried out utilizing a foil of a metallic aside from gold?(*9*)

Sol.(*4*)(*9*)

If the α-particle scattering experiment is carried out utilizing a foil of a metallic aside from gold, there could be no change in the commentary. Rutherford used gold for α-particle scattering experiment as a result of gold is the most malleable metallic. Extra thick foils may be made by different metals like platinum. As the thickness of the foil will increase, the risk of correctness of the experiment decreases. So use of gold in this case is most well-liked.(*9*)

Q.(*4*) What are the limitations of JJ Thomson’s mannequin of the atom?(*9*)

Sol.(*4*)(*9*)

Limitations of Thomson’s mannequin of atom are:(*9*)

1. Thomson’s mannequin couldn’t clarify the experimental outcomes of different scientists similar to Rutherford, as there isn’t a nucleus in the atomic mannequin proposed by Thomson.(*9*)

2. It doesn’t have any experimental proof in its help.(*9*)

Q.(*4*) What are the limitations of Rutherford’s mannequin of the atom?(*9*)

Sol.(*4*)(*9*)

Limitations of Rutherford’s mannequin of an atom(*9*)

1. The soundness of the atom couldn’t be defined. As a result of when a charged particle revolves in a round orbit, it radiates vitality constantly resulting from accelerated movement. This makes atom extremely unstable. However we all know that the atom is steady.(*9*)

2. Rutherford’s mannequin couldn’t clarify the distribution of electrons in the further nuclear portion of the atom.(*9*)

To get the full answer click on on the following hyperlink:(*4*)(*9*)

Additionally Verify: CBSE Class 9 Science Full & Greatest Research Materials for 2021-2022(*4*)(*9*)

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