If a black body is heated at a high temperature, it seems to be

Options

A. blue
B. green
C. white
D. red

Answer

To solve the question regarding the color observed when a black body is heated to a high temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Black Body Radiation**:
A black body is an idealized physical object that absorbs all incoming radiation and re-emits energy in the form of thermal radiation. The color of the radiation emitted depends on the temperature of the body.

**Hint**: Remember that a black body is a perfect absorber and emitter of radiation.

2. **Wien's Displacement Law**:
According to Wien's Displacement Law, the wavelength at which the emission of radiation is maximized is inversely proportional to the temperature of the black body. This means that as the temperature increases, the peak wavelength of emitted radiation decreases.

**Hint**: Recall that higher temperatures correspond to shorter wavelengths.

3. **Color and Temperature Relationship**:
Different colors correspond to different wavelengths of light. For example:
- Red light has a longer wavelength and corresponds to lower temperatures.
- Blue light has a shorter wavelength and corresponds to higher temperatures.
- White light contains all colors and has the shortest wavelengths among visible light.

**Hint**: Think about how colors relate to temperature; red is cooler and blue/white is hotter.

4. **Identifying the Highest Temperature**:
When a black body is heated to a very high temperature, it will emit radiation that appears white. This is because white light is a combination of all visible colors and indicates that the body is at a very high temperature.

**Hint**: Consider what happens to the color spectrum as temperature increases.

5. **Conclusion**:
Therefore, if a black body is heated to a high temperature, it will appear white, indicating that it is at its maximum temperature.

**Final Answer**: The correct option is **white**.