Light behaves as both a particle and a wave

Light is a form of electromagnetic radiation. It comes in discrete packets called photons. Light also behaves as if it were propagated in waves. The amount of energy contained in a single photon is inversely proportional to its wavelength: the shorter the wavelength, the greater the energy of the photons. For example, a photon of red light of wavelength 660 nm has less energy than a photon of blue light at 430 nm.

Thylakoid Stroma
8.3 An Overview of Photosynthesis The complete photosynthetic reaction comprises two pathways: the light reactions and the Calvin-Benson cycle.These reactions take place in the thylakoids (shown in the micrograph at right) and stroma of chloroplasts, respectively.

Two things are required for photons to be active in a biological process:

► Photons must be absorbed by a receptive molecule.

► Photons must have sufficient energy to perform the chemical work required.

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Essentials of Human Physiology

Essentials of Human Physiology

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  • pia
    Why light behaves as particle?
    8 years ago

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