Q.43. In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back

Q: What is the correct answer for JEE Main Physics Q43?

The correct answer is D. Sol. Theoretical. In Rutherford's alpha-particle scattering experiment, the key observations and conclusions are: 1. Most alpha particles pass straight through, indicating that most of the atom is empty space. 2. A few alpha particles are deflected at large angles, and a very small number (about 1 in 8000) rebound back. This indicates the presence of a small, dense, positively charged nucleus. (A)

Q: Q.43. In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because (A) The size of gold nucleus is very small as compared to the size of gold atom. (B) Alpha…

The correct answer is D. Sol. Theoretical. In Rutherford's alpha-particle scattering experiment, the key observations and conclusions are: 1. Most alpha particles pass straight through, indicating that most of the atom is empty space. 2. A few alpha particles are deflected at large angles, and a very small number (about 1 in 8000) rebound back. This indicates the presence of a small, dense, positively charged nucleus. (A)

Q: What are the options for this JEE Main Physics question?

A. A, B Only · B. B, E Only · C. C,D Only · D. A,C,E Only

Question

Q.43. In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because (A) The size of gold nucleus is very small as compared to the size of gold atom. (B) Alpha particle and gold nucleus have equal charge. (C) The impact parameter is minimum for a few alpha particles. (D) A few alpha particles have very high kinetic energy. (E) Only a few alpha particles undergo head-on collision with the nuclei. Choose the correct answer from the options given below :

FirstInTest · Accepted Answer

Sol. Theoretical. In Rutherford's alpha-particle scattering experiment, the key observations and conclusions are: 1. Most alpha particles pass straight through, indicating that most of the atom is empty space. 2. A few alpha particles are deflected at large angles, and a very small number (about 1 in 8000) rebound back. This indicates the presence of a small, dense, positively charged nucleus. (A) The size of the gold nucleus is indeed very small compared to the size of the gold atom, which allows most alpha particles to pass through. This is a correct reason. (B) Alpha particles have a charge of +2e, while gold nuclei have a charge of +79e. They do not have equal charge. This statement is incorrect. (C) The impact parameter is the perpendicular distance between the velocity vector of the alpha particle and the center of the nucleus. For particles that rebound back, the impact parameter is minimum (close to zero), leading to head-on collisions and maximum repulsion. This is a correct reason. (D) Alpha particles have very high kinetic energy, which is necessary for them to approach the positively charged nucleus closely despite electrostatic repulsion. This is a correct statement, but not the direct reason for *only a few* rebounding. It's a condition for the experiment. (E) Only a few alpha particles undergo head-on collision with the nuclei. This is a direct observation and a consequence of the small size of the nucleus and the minimum impact parameter. This is a correct reason. So, A, C, E are correct reasons. Therefore, option (4) is correct.

Answer

A, B Only

Answer

B, E Only

Answer

C,D Only

Answer

A,C,E Only

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