Verified Solution • 2025–26 Session moderate

QPages 393-394: Q6: HC Verma: Concepts of Physics - Volume 2 X-Rays Pages 393-394: Q6 Solution: Moseley's Law for characteristic X-ray is . Here,

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently assume the slope $a$ and screening constant $b$ vary with each element, interpreting them as material‑specific parameters. In reality, for a given series (K, L, etc.) $a$ and $b$ are fixed constants; only the atomic number $Z$ changes the frequency.

Moseley's Law for characteristic X-ray is ν=aZ−b)\sqrt{\nu} = a Z - b). Here,

Multiple Choice Options

  • A both a and b are independent of the material
  • B a is independent but b depends on the material
  • C b is independent but a depends on the material
  • D both a and b depend on the material

Step-by-Step Verified Solution

**Answer:** (a) both a and b are independent of the material. **Step-by-Step Explanation:** In Moseley's law �_ = a(Z-b), a and b are constants that depend only on the type of transition (K, L, etc.), not on the material.

All Questions in this Chapter

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