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Nuclei — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsNuclei1 Mark
Question
For question, statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a) (b) (c) and (d) as given below.
  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is NOT the correct explanation of A.
  3. A is true, but R is false.
  4. A is false and R is also false.
Assertion (A): Two protons can attract each other.
Reason (R): The distance between the protons within the nucleus is about 10-15m
✓

Answer

  1. Both A and R are true, and R is the correct explanation of A.

Explanation:

Due to electrostatic forces between two protons (like charges) there is a force of repulsion. However, when the distance between them is ~ 10-15m they come under the influence of the short range, strong nuclear forces. (The range of the nuclear forces is ~ 10-15m). These forces are attractive forces and charges independent. The net force on the protons is attractive, as nuclear forces are much stronger than electrostatic forces. The protons attract each other.

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