The material through which heat radiations cannot pass is known as

Options

A. bad conductor
B. bad conductor
C. diathermanous
D. athermanous

Answer

To solve the question, "The material through which heat radiations cannot pass is known as," we need to analyze the options provided and understand the definitions of each term.

### Step-by-Step Solution:

1. **Understand the Question**: We are looking for a specific type of material that does not allow heat radiation to pass through it.

2. **Analyze the Options**:
- **Bad Conductor**: These materials do not conduct heat well, but they may still allow some heat radiation to pass through.
- **Good Conductor**: These materials conduct heat very well, allowing heat radiation to pass easily.
- **Dithermanous**: This term generally refers to materials that allow some heat radiation to pass through.
- **Athermanous**: This term refers to materials that do not allow heat radiation (such as infrared and ultraviolet rays) to pass through.

3. **Identify the Correct Answer**: Based on the definitions:
- The correct answer is **Athermanous**, as it is specifically defined as a material through which heat radiations cannot pass.

4. **Conclusion**: Therefore, the material through which heat radiations cannot pass is known as **Athermanous**.

### Final Answer:
The material through which heat radiations cannot pass is known as **Athermanous**.

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