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The Compton effect and photoelectric effect are quantum phenomena that require particle theory. Electromagnetic wave theory explains wave phenomena like reflection refraction polarization but FAILS to explain the photoelectric effect and Compton effect because classical waves cannot explain the discrete energy exchange observed in these phenomena. Newton's corpuscular theory (1704) treated light as tiny particles (corpuscles). While it could explain reflection and refraction qualitatively it predicts that light travels FASTER in denser media which is experimentally incorrect. It also cannot explain the Compton effect. The photon theory (Einstein 1905) treats light as discrete packets of energy called photons. Each photon carries energy E = hf where h = Planck's constant and f = frequency. This explains: photoelectric effect (photon gives all energy to one electron) Compton effect (photon scatters off electron like a billiard ball collision). Huygens wave theory explains wave phenomena like interference diffraction but cannot explain particle phenomena like the photoelectric effect.
FAQ
Common questions and clear answers for this topic.
Optics is the branch of physics that studies the behavior of light, including its reflection, refraction, and interaction with lenses and mirrors.
Reflection is the bouncing back of light when it strikes a surface, while refraction is the bending of light as it passes from one medium to another with a different optical density.
A lens is a transparent optical device with curved surfaces that refracts light to converge or diverge rays, commonly classified as convex (converging) or concave (diverging).
The speed of light in a vacuum is approximately 3 x 10^8 meters per second, denoted by the symbol c.
Total internal reflection occurs when light traveling from a denser medium to a rarer medium strikes the boundary at an angle greater than the critical angle, causing it to be completely reflected back into the denser medium.
