Question

The phenomenon of physics that deals with the constitution and structure of matter at the minute scales of atoms and nuclei is

• A. Microscopic domain
• B. Macroscopic domain
• C. Classical physics
• D. Thermodynamics

Hint:

Remember keywords to differentiate the domains. For the microscopic domain, think of "atoms," "nuclei," "electrons," and "quantum." For the macroscopic domain, think of "planets," "projectiles," "cars," and "bulk properties."

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Physics is broadly divided into two domains of interest: the macroscopic domain and the microscopic domain.
- The macroscopic domain includes phenomena at the laboratory, terrestrial, and astronomical scales. It deals with objects that are large enough to be seen and handled directly.
- The microscopic domain includes phenomena at the atomic, molecular, and nuclear scales. It deals with the fundamental constituents of matter.
Step 2: Detailed Explanation:
The question asks about the branch of physics concerned with the "constitution and structure of matter at the minute scales of atoms and nuclei."
- This description directly corresponds to the definition of the microscopic domain. Quantum mechanics is the primary theory used to describe this domain.
- Classical physics (Option C) mainly deals with the macroscopic domain, describing the motion of objects, fluids, and waves on a large scale.
- Thermodynamics (Option D) also deals with macroscopic systems in terms of heat, work, and temperature.
Therefore, the study of atoms and nuclei falls squarely within the microscopic domain.
Step 3: Final Answer:
The correct option is (A) because the microscopic domain is the area of physics that studies the structure and behavior of matter on the scale of atoms and nuclei.