All
types of Electromagnetic radiations propagates as waves. However, the
energy imparted by the wave is absorbed at single location the way
particles are absorbed. When a wave of light is transformed and
absorbed as a photon, the energy of the wave instantly collapses to a
single location and thus location is where the photons arrives. This
is called wave function collapse. This dual wave-like and
particle-like nature oif light is known as the wave-particle duality.
An
EM radiation tends to behave more like a classical wave at lower
frequencies but more like a classical particle at higher
frequencies, but never completely loses all qualities of one or the
other. Visible light occupies a middle ground in frequency, that can
easily be shown in experiments to be describable using either a wave
or a particle model or sometime both.
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