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

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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  • pia
    Why light behaves as particle?
    8 years ago

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