Black bodies are

Options

A. good absorbers and bad radiators
B. good absorbers and good radiators
C. bad absorbers and good radiators
D. bad absorbers and bad radiators

Answer

### Step-by-Step Solution:

1. **Understanding Black Bodies**:
- A black body is defined as an idealized physical object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. It is considered a perfect absorber of heat.

2. **Properties of Black Bodies**:
- Black bodies not only absorb heat effectively but also emit heat effectively. This means they are good at both absorbing and radiating thermal energy.

3. **Options Analysis**:
- Option 1: Good absorbers but bad radiators - This is incorrect because black bodies are also good radiators.
- Option 2: Good absorbers and good radiators - This is correct as black bodies excel in both absorption and radiation of heat.
- Option 3: Bad absorbers and good radiators - This is incorrect because black bodies are excellent absorbers.
- Option 4: Bad absorbers and bad radiators - This is incorrect as black bodies are the opposite of this description.

4. **Conclusion**:
- Based on the properties of black bodies, the correct answer is Option 2: Good absorbers and good radiators.