This question asks about the relative masses of a proton and an electron. To answer this, we need to recall the approximate masses of these subatomic particles and then determine their ratio.
Therefore, the mass of a proton is approximately 2000 times the mass of an electron.
Correct Option: C) 2000 times
The question asks for the year in which James Chadwick discovered the neutron. This is a direct factual recall question related to the history of atomic structure and fundamental particles in physics. We need to identify the correct year associated with Chadwick's discovery.
A) 1932 — James Chadwick discovered the neutron in 1932. This discovery was crucial for understanding the atomic nucleus and led to the development of nuclear fission and the atomic bomb.
The question asks about James Chadwick's experiment that led to the discovery of the neutron. This is a fundamental concept in atomic physics and a common topic in competitive exams. The key is to recall the specific element used as a target in his experiment.
Correct Option: B) James Chadwick discovered the neutron by bombarding a thin sheet of beryllium with alpha particles. This experiment was crucial in establishing the modern understanding of atomic structure.
The question asks about the charge carried by a neutron. To answer this, we need to recall the basic properties of subatomic particles: protons, neutrons, and electrons, specifically their electrical charges.
Correct Option: A) No charge (neutral) is correct because neutrons are defined as subatomic particles that possess no net electrical charge.
The question asks to identify which fundamental particle of an atom has a mass nearly equal to that of a proton. We need to recall the approximate masses of protons, neutrons, and electrons, and also consider the other options provided.
Correct Option: D) Neutron
A neutron has a mass of approximately \(1.674 \times 10^{-27} \text{ kg}\), which is very close to the mass of a proton (\(1.672 \times 10^{-27} \text{ kg}\)). In many calculations, their masses are often considered approximately equal to \(1 \text{ amu}\).
The question asks for the popular name of J.J. Thomson's atomic model. This requires recalling the historical development of atomic models and their common analogies or names.
Correct Option: C) Watermelon model (Plum pudding model)