There is a rough black spot on a polished metallic plate. It is heated upto 1400 K approximately and then at once taken in a dark room. Which of the following statements is true

Options

A. In comparison with the plate, the spot will shine more
B. In comparison with the plate, the spot will appear more black
C. The spot and the plate will be equally bright
D. The plate and the black spot can not be seen in the dark room

Explanation

To solve the problem, we need to analyze the behavior of the rough black spot and the polished metallic plate when heated to a high temperature (1400 K) and then placed in a dark room.

### Step-by-Step Solution:

1. **Understanding the Properties of the Materials**:
- The rough black spot is considered a black body, which means it is a good absorber of heat and also a good emitter of radiation.
- The polished metallic plate, on the other hand, is a poor absorber and primarily reflects radiation.

2. **Heating the Materials**:
- Both the black spot and the metallic plate are heated to the same temperature of 1400 K. At this temperature, both will emit thermal radiation, but the amount and intensity of radiation emitted will differ due to their material properties.

3. **Emission of Radiation**:
- Since the black spot is a good emitter (as it is a good absorber), it will emit more thermal radiation compared to the polished metallic plate, which emits less radiation due to its reflective nature.

4. **Observation in a Dark Room**:
- When taken into a dark room, the black spot will continue to emit more radiation and will appear brighter than the polished metallic plate. The polished metallic plate will not emit as much radiation and will appear dimmer in comparison.

5. **Conclusion**:
- Therefore, the correct statement is: "In comparison with the plate, the spot will shine more."

### Final Answer:
The correct option is: **In comparison with the plate, the spot will shine more.**

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