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Photosynthesis Part 1

Photosynthesis Part 1. The Electromagnetic Spectrum. Light as a wave. Light travels in waves and its energy can be measured in wavelengths. Short wavelengths are high energy Long wavelengths are low energy. Visible Light Spectrum.

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Photosynthesis Part 1

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  1. Photosynthesis Part 1

  2. The Electromagnetic Spectrum

  3. Light as a wave • Light travels in waves and its energy can be measured in wavelengths. • Short wavelengths are high energy • Long wavelengths are low energy

  4. Visible Light Spectrum • White light or visible light is a blend of all visible wavelengths • This range is from 400 to about 800nm • 1nanometer is 1 billionth of a meter!

  5. When Light Interacts with matter • 1. Light passes through the matter (transparent) • 2. Light is reflected (resulting in the colors you see) • 3. Light is absorbed (energy is released as heat or used to excite electrons to make chemical bonds!)

  6. Light as a particle • Although light travels in waves, it also behaves as a particle. • Light particles are called photons. • Photons traveling in short wavelengths have high energy. • Photons traveling in long wavelengths have low energy. • When photons hit atoms, they can excite the atom’s electrons or move them into a higher energy state (Einstein –Photoelectric effect) • These high energy electrons can then form chemical bonds

  7. Albert Einstein won the Nobel Prize for his work on the Photoelectric effect which showed that light can behave as a particle called a photon. These photons can excite electrons to higher energy levels allowing them to form chemical bonds to make, let’s say, GLUCOSE! Einstein and the Photoelectric Effect

  8. Photosynthetic Pigments • A pigment is a substance that absorbs particular wavelengths of light. • The colors that you see are the wavelengths that are reflected, not absorbed. • If chlorophyll is a green pigment, then what wavelength is not being absorbed? • GREEN

  9. Photosynthetic Pigments • Chlorophyll: Two kinds – Chlorophyll A and Chlorophyll B. -Both Chlorophyll A and B absorb red and blue wavelengths and reflect green -Chlorophyll A is the primary photosynthetic pigment – directly involved in converting sun energy into chemical energy -Chlorophyll B and other pigments absorb light energy and transfer the energy to chlorophyll A.

  10. Other Photosynthetic Pigments • Carotenes: reflect orange wavelengths • Xanthophylls: reflect yellow wavelengths • These two pigments allow plants to use a wider range of wavelengths than chlorophyll alone. • They are also what gives fall leaves their various colors after the plant shuts down chlorophyll production

  11. Absorption Spectrum for Plant Pigments • Absorption spectrum: wavelengths absorbed by a pigment

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