One of the domains of physics “ microscopic" Deals with the phenomena at
I) atomic- level II) molecular- level III) nuclear -leve

Options

A. Only I and III are correct
B. Only I and II are correct
C. Only II and III are correct
D. I, II, and III are correct

Answer

To solve the question regarding the domains of physics that the term "microscopic" deals with, we can analyze the options provided:

1. **Atomic Level**: The atomic level refers to the scale of individual atoms, which is indeed a microscopic scale. At this level, we can study the properties and behaviors of atoms, including their interactions and arrangements.

2. **Molecular Level**: The molecular level involves molecules, which are groups of atoms bonded together. This level is also considered microscopic as it deals with the structure and behavior of substances at a scale that is not visible to the naked eye.

3. **Nuclear Level**: The nuclear level pertains to the components of an atom's nucleus, such as protons and neutrons. This level is microscopic as well, focusing on the interactions and properties of these subatomic particles.

Since all three levels—atomic, molecular, and nuclear—are considered microscopic phenomena, we can conclude that the term "microscopic" encompasses all of these domains.

### Final Answer:
The microscopic domain of physics deals with phenomena at:
- I) Atomic Level
- II) Molecular Level
- III) Nuclear Level

Thus, the correct answer is **D) All of the above (I, II, and III)**.