- Exam
- JEE Main
- Year
- 2024
- Date
- 1 February
- Shift
- Evening Shift
- Subject
- Physics
- Chapter
- Nuclear Physics
JEE Main 2024 · 1 February · Evening Shift · Physics · Nuclear Physics
From the statements given below : (A) The angular momentum of an...
(A) The angular momentum of an electron in orbit is an integral multiple of .
(B) Nuclear forces do not obey inverse square law.
(C) Nuclear forces are spin dependent.
(D) Nuclear forces are central and charge independent.
(E) Stability of nucleus is inversely proportional to the value of packing fraction.
Choose the correct answer from the options given below :
Options
- A(A), (B), (C), (D) only
- B(A), (C), (D), (E) only
- C(A), (B), (C), (E) only
- D(B), (C), (D), (E) only
Correct answer
C. (A), (B), (C), (E) only
Step-by-step solution
(A) Electron revolves around nucleus only in those orbits for which the angular momentum is an integral multiple of .
(B) Nuclear force does not follow the inverse square law.
(C) Nuclear forces are spin dependent but charge independent.
(D) Nuclear force is attractive in nature. It is a non central force, meaning it does not depend upon the distance between the particles but rather upon their orientation. Nuclear force is stronger if the spin is parallel; and weak if it is anti parallel.
(E) The negative value (less quantity) of packing fraction indicates that the isotope is stable. Positive value of packing fraction implies unstable (radioactive) nucleus. Also, the stability of the nucleus is inversely proportional to the value of the packing fraction.