Object are exposed to the X-rays in a dark room. They will appear

Options

A. invisible
B. white
C. yellow
D. red

Answer

To solve the question "Objects are exposed to X-rays in a dark room. They will appear:", we can follow these steps:

### Step 1: Understand the nature of X-rays
X-rays are a form of electromagnetic radiation that have wavelengths shorter than ultraviolet light. They are part of the electromagnetic spectrum.

### Step 2: Consider the visibility of X-rays
X-rays are not visible to the human eye. This means that even if an object is exposed to X-rays, we cannot see the X-rays themselves or the effects they produce without specialized equipment.

### Step 3: Analyze the scenario
In a dark room, since there is no other light source, and considering that X-rays are not visible, the objects exposed to X-rays will not emit any visible light. Therefore, they will remain invisible to the observer.

### Step 4: Conclusion
Since X-rays do not produce visible light and cannot be seen by the human eye, the objects exposed to X-rays in a dark room will appear invisible.

### Final Answer
The objects will appear **invisible**.

---