Which object will emit more electromagnetic radiation than it absorbs from its surroundings?

Options

A. `600^(@)C` lead sphere in a `700^(@)C` overn.
B. A girl scout sitting close to a campfire.
C. An ice cube in beaker of water at `50^(@)C`
D. A `200^(@)C` copper coin in a beaker of water at `98^(@)C`.

Answer

To determine which object will emit more electromagnetic radiation than it absorbs from its surroundings, we need to analyze the temperature of each object in relation to its surroundings. The key principle here is that an object will emit more radiation than it absorbs when it is at a higher temperature than its surroundings.

### Step-by-Step Solution:

1. **Understanding Emission and Absorption**:
- Objects emit electromagnetic radiation based on their temperature. The higher the temperature, the more radiation they emit.
- Conversely, objects absorb radiation from their surroundings. If the surrounding temperature is higher than the object's temperature, the object will absorb more radiation than it emits.

2. **Analyzing the Options**:
- **Option A**: A 600°C led sphere in a 700°C oven.
- The sphere is at a lower temperature than the oven. It will absorb more radiation from the oven than it emits. **(Not the answer)**

- **Option B**: A girl scout sitting close to a campfire.
- The campfire is at a higher temperature than the girl scout. She will absorb more radiation from the fire than she emits. **(Not the answer)**

- **Option C**: An ice cube in a beaker of water at 50°C.
- The ice cube is at 0°C (or lower), while the water is at a higher temperature. The ice cube will absorb more radiation from the water than it emits. **(Not the answer)**

- **Option D**: A 200°C copper coin in a beaker of water at 98°C.
- The copper coin is at a higher temperature than the water. It will emit more radiation than it absorbs from the water. **(This is the answer)**

3. **Conclusion**:
- The object that will emit more electromagnetic radiation than it absorbs from its surroundings is the **200°C copper coin in a beaker of water at 98°C**.

### Final Answer:
**Option D: 200°C copper coin in a beaker of water at 98°C.**