During the 19th century, light was considered to be a stream of particles called

Options

A. atoms
B. electrons
C. corpuscles
D. quantas

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term used to describe light during the 19th century, when it was thought to be a stream of particles.

2. **Identifying the Options**: The options provided are:
- Atoms
- Electrons
- Corpuscles
- Content (which seems to be an incorrect option)

3. **Evaluating Each Option**:
- **Atoms**: Atoms are the basic units of matter, but they are not specifically related to light. Therefore, this option is incorrect.
- **Electrons**: Electrons are subatomic particles, but they were not the term used to describe light in the 19th century. This option is also incorrect.
- **Corpuscles**: This term refers to small particles and is indeed the term used to describe light in the context of the corpuscular theory of light. This option is correct.
- **Content**: This option does not relate to the question and is incorrect.

4. **Conclusion**: The correct answer is "Corpuscles". In the 19th century, light was considered to be made up of particles called corpuscles.

5. **Explanation of the Term**: The term "corpuscles" comes from the theory of corpuscularianism, which states that all matter is composed of minute particles. This theory was significant in the 17th century and influenced the understanding of light as being made up of small particles called photons.