3-26 photosystems-vision

3-26 photosystems-vision - PHOTOSYSTEMS/VISION LIFE...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
PHOTOSYSTEMS/VISION 8.2.1 Light behaves both as 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. -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 8.2.2 Absorbing a photon excites a pigment molecule -When a photon meets a molecule , one of three things happens: The photon may bounce off the molecule—it may be scattered or reflected . The photon may pass through the molecule—it may be transmitted . The photon may be absorbed by the molecule . -in the case of absorption, the photon disappears, but the energy is does not. When a molecule absorbs a photon , that molecule acquires the energy of the photon . It is thereby raised from a ground state (with lower energy ) to an excited state (with higher energy ) more chemically reactive 8.2.3 Absorbed wavelengths correlate with biological activity - Molecules that absorb wavelengths in the visible spectrum —that region of the spectrum that is visible to humans as light—are called pigments - absorption spectrum : wavelengths
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

3-26 photosystems-vision - PHOTOSYSTEMS/VISION LIFE...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online