Verified Solution • 2025–26 Session moderate

QPages 393-394: Q2: HC Verma: Concepts of Physics - Volume 2 X-Rays Pages 393-394: Q2 Solution: Consider a photon of a continuous X-ray coming from a Coolidge…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently mistake the origin of continuous X‑ray photons, attributing their energy to target electrons, ions, or atomic transitions; however, bremsstrahlung photons draw their energy solely from the kinetic energy of the incoming electron that is decelerated in the target.

Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from

Multiple Choice Options

  • A the kinetic energy of the striking electron
  • B the kinetic energy of the free electrons of the target
  • C the kinetic energy of the ions of the target
  • D an atomic transition in the target

Step-by-Step Verified Solution

**Answer:** (a) the kinetic energy of the striking electron. **Step-by-Step Explanation:** Continuous X-rays are produced by bremsstrahlung (braking radiation) when electrons decelerate in the target.

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