Conceptual Questions Based on Class 12 Physics Atoms

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Conceptual Questions Based on Class 12 Physics Atoms

Here we are providing conceptual questions for Class 12 Physics Chapter 12 Atoms. Students should go through each and every question for better understanding.

Table of Contents

Q.1. The large angle scattering is possible only due to nucleus. Why?

Solution, α-particles can be scattered through large angles only if they collide against a positively charged heavy particle such as a nucleus.

Q.2. The Rutherford α-particle scattering experiment shows that most of the α-particles pass through almost unscattered while some of them are scattered through large angles. What information does it give about the structure of atom?

Solution. (i) As most of α-particles pass straight, it indicates that most of the space in the atom is empty.

(ii) The large angle scattering indicates that most of the mass and the entire positive charge of the atom is concentrated in a small central core, called nucleus.

Q.3. Why is electron revolving round the nucleus of an atom?

Solution. If the electrons were stationary, they would fall into the nucleus due to the electrostatic attraction and the atom would be unstable.

Q.4. What is the significance of the negative energy of electron in the orbit?

Solution. This signifies that the electron is bound to the nucleus. Due to electrostatic attraction between electron and nucleus, the P.E. is negative and is greater than K.E. of electron. Total energy of electron is negative.
It cannot escape from the atom.

Q.5. When an electron falls from a higher energy to a lower energy level, the difference in the energies appears in the form of electromagnetic
radiation. Why cannot it be emitted as other forms of energy?

Solution. This is because electrons interact only electromagnetically.

Q.6. Explain why the spectrum of hydrogen atom has many lines, although a hydrogen atom contains only one electron.

Solution. A source of hydrogen spectrum has billions of hydrogen atoms. Each hydrogen atom has many stationary states. All possible transitions can occur from
any higher level to any lower level. This gives rise to a large number of spectral lines.

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Conceptual Questions Based on Class 12 Physics Atoms

Conceptual Questions Based on Class 12 Physics Atoms

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Conceptual Questions Based on Class 12 Physics Atoms

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