Verified Solution • 2025–26 Session moderate

QPage 363: Q11: HC Verma: Concepts of Physics - Volume 2 Photoelectric Effect and Wave-Particle Duality Page 363: Q11 Solution: Is valid for electrons?

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently plug the photon relation $p=E/c$ into electron problems, overlooking the electron's non‑zero rest mass; always start from $E^2=p^2c^2+m_0^2c^4$ and solve for $p$, not $p=E/c$.

Is p−E/cp - E/c valid for electrons?

Step-by-Step Verified Solution

**Answer:** No, p=E/cp = E/c is not valid for electrons. **Step-by-Step Explanation:** The relation p=E/cp = E/c is valid only for particles with zero rest mass (like photons). For electrons (which have non-zero rest mass), the correct relativistic relation is E2=p2c2+m02c4E^2 = p^2c^2 + m_0^2c^4, so p≠E/cp \neq E/c.

All Questions in this Chapter

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