Good absorbers of heat are

Options

A. Poor emitters
B. Non-emitters
C. Good emitters
D. Highly polished

Answer

To solve the question "Good absorbers of heat are?", we can follow these steps:

### Step 1: Understand the Concept of Absorption and Emission
Good absorbers of heat are materials that can effectively absorb thermal energy. According to Kirchhoff's law of thermal radiation, the ability of a body to absorb heat is directly related to its ability to emit heat.

### Step 2: Kirchhoff's Law of Thermal Radiation
Kirchhoff's law states that at thermal equilibrium, the emissivity (the ability to emit radiation) of a body is equal to its absorptivity (the ability to absorb radiation) at a given temperature. This means that materials that are good at absorbing heat are also good at emitting heat.

### Step 3: Identify Good Absorbers
Based on Kirchhoff's law, good absorbers of heat are typically materials that have high emissivity. These materials are often dark and rough in texture. For example, black surfaces are known to be excellent absorbers of heat.

### Step 4: Conclusion
Therefore, the answer to the question "Good absorbers of heat are?" is that they are also good emitters of heat, as per Kirchhoff's law.

### Final Answer
Good absorbers of heat are good emitters of heat.

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