Which of the following waves is used for locating the cracks in the ships?

Options

A. X-rays
B. Gamma rays
C. UV rays
D. None

Explanation

To solve the question "Which of the following waves is used for locating the cracks in the ships?", we can follow these steps:

### Step 1: Understand the Question
The question asks about the type of waves that are used to locate cracks in ships. This implies we need to identify a wave type that can penetrate materials and reveal internal flaws.

### Step 2: Analyze the Options
The options provided are:
1. X-rays
2. Gamma rays
3. UV rays
4. None

### Step 3: Evaluate Each Option
- **X-rays**: X-rays are known for their ability to penetrate various materials. They are commonly used in medical imaging and industrial applications to detect internal flaws in structures, including ships.
- **Gamma rays**: While gamma rays also have high penetration power, they are typically used in different contexts, such as radiation therapy and nuclear applications, rather than for detecting cracks in ships.
- **UV rays**: Ultraviolet rays have limited penetration capabilities and are not suitable for locating cracks in dense materials like metal.
- **None**: This option suggests that none of the above waves are used, which we know is incorrect since X-rays are indeed used.

### Step 4: Conclusion
Based on the analysis, the correct answer is **X-rays**, as they are specifically utilized for detecting cracks and flaws in ships due to their penetrating ability.

### Final Answer
**X-rays** are used for locating the cracks in ships.

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