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QPage 363: Q13: HC Verma: Concepts of Physics - Volume 2 Photoelectric Effect and Wave-Particle Duality Page 363: Q13 Solution: If an electron has a wavelength, does it also have a colour?
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often mistake any wavelength for a colour, assuming an electron’s de Broglie wavelength would appear as a hue. Emphasize that colour is a perceptual effect of visible‑range photons; a massive particle’s wavelength is not electromagnetic radiation and cannot be seen, even if its numerical value falls within the visible spectrum.
If an electron has a wavelength, does it also have a colour?
Step-by-Step Verified Solution
**Answer:** No, an electron does not have a colour even though it has a wavelength.
**Step-by-Step Explanation:**
Colour is a physiological sensation produced when light of a particular wavelength falls on the retina. Electrons are material particles and do not emit light; their de Broglie wavelength is not associated with any colour. Hence, an electron has no colour.
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