Practice portal › Dual Nature of Matter and Radiation › Conceptual and Statement Questions on the Photoelectric Effect
Asked in RS Academy GUJCET booklet · Conceptual points of the photoelectric effect
Idea: a particle is localised: it is found in a limited region of space.
A single harmonic wave of definite wavelength extends over all space, so it cannot describe a localised particle.
Adding many harmonic waves with wavelengths spread around λ gives a wave packet: the waves reinforce in one region and cancel elsewhere.
So in quantum mechanics a particle is regarded as a group of harmonic waves (a wave packet).
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