Classical physics is inadequate to deal with

Options

A. Rigid bodies, deformable bodies, electrons
B. Rigid body, deformable bodies, system of particles
C. Electrons, photons, elementary particles
D. Rigid bodies, photons, electrons

Answer

**Step-by-Step Solution:**

1. **Understanding Classical Physics**:
- Classical physics refers to the branch of physics that deals with the laws of motion, gravity, and the behavior of macroscopic objects. It includes concepts such as rigid bodies, deformable bodies, and systems of particles.

2. **Analyzing the Options**:
- The options provided are:
a) Rigid body
b) Deformable bodies
c) Electrons
- We need to determine which of these is inadequately addressed by classical physics.

3. **Evaluating Rigid Bodies and Deformable Bodies**:
- Rigid bodies are objects that do not deform under stress, and classical physics can adequately describe their motion and interactions.
- Deformable bodies are those that can change shape under stress, and classical physics also has frameworks (like elasticity theory) to describe their behavior.

4. **Considering Electrons**:
- Electrons are subatomic particles that exhibit behaviors that cannot be explained by classical physics. Their behavior is better described by quantum mechanics, which accounts for phenomena such as wave-particle duality and uncertainty.

5. **Conclusion**:
- Since rigid bodies and deformable bodies are both adequately described by classical physics, while electrons are not, the answer to the question is that classical physics is inadequate to deal with **electrons**.

**Final Answer**: Classical physics is inadequate to deal with **electrons** (Option c).

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