Verified Solution • 2025–26 Session moderate

QPages 393-394: Q5: HC Verma: Concepts of Physics - Volume 2 X-Rays Pages 393-394: Q5 Solution: If the current in the circuit for heating the filament is…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that raising the filament current changes the X‑ray spectrum because it increases electron emission, but the cutoff wavelength $lambda_{\min}=\frac{hc}{eV}$ is set only by the accelerating voltage $V$. The filament current affects intensity, not the maximum photon energy.

If the current in the circuit for heating the filament is increased, the cutoff wavelength

Multiple Choice Options

  • A will increase
  • B will decrease
  • C will remain unchanged
  • D will change

Step-by-Step Verified Solution

**Answer:** (c) will remain unchanged. **Step-by-Step Explanation:** The cutoff wavelength depends only on the accelerating voltage, not on the filament current.

All Questions in this Chapter

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