What does light do, and what does light do

1. Photosynthesis.

2. Light fractionation.

3. Reflex.

4. The effect of light lotus.

5. Optomediac.

6. Refraction.

7. Phototherapy effect.

8. The role of light in life.

9. The disinfection effect of light.

10. The beauty effect of light, etc.

The difference between photosynthesis and respiration is:

1. The parts that occur are different, photosynthesis actually needs cells with chloroplasts to be carried out, while respiration is the ability of living cells in all parts to be carried out, because living cells need to have life activities, which requires energy to be able to support, and respiration is to be able to provide such energy.

2. The products are also different, the products of photosynthesis are actually organic matter and oxygen, but the products of respiration are carbon dioxide and water.

3. The transformation of energy is also different, photosynthesis is able to produce organic matter, which can convert light into energy storage, but respiration is the opposite, it is necessary to decompose organic matter, so as to provide energy for life. As for the relationship between the two, it is interdependent.

Characteristics of light: It travels in a straight line, but when it encounters a reflection plane, it will reflect, if the light is perpendicular to the reflecting surface, the angle of incidence and the angle of reflection are both 90°, the light will return the same way.

The role of light: photosynthesis, reflex, phototherapy, disinfection, etc.

Light is a physical term whose essence is a stream of photons in a specific frequency band. A light source emits light because the electrons in the light source gain extra energy.

If the energy is not enough to make it jump to a more outer orbit, the electrons undergo an accelerated motion and release the energy in the form of a wave. If the transition is followed by just enough to fill the vacancy in the orbit and from the excited state to the stable state, the electron stops transitioning. Otherwise, the electrons jump back to their previous orbits again and release energy in the form of waves.

Light has four important characteristics at the same time:

In geometric optics, light travels in a straight line. This is illustrated by the straight pillars of light and the sun's rays.

In wave optics, light travels in the form of waves. Light is like water waves on the surface of the water, and different wavelengths of light appear different colors.

The speed of light is extremely fast. 299792458 3 10 ms in a vacuum, slower in air. In media with a larger refractive index, such as water or glass, the propagation speed is even slower.

In quantum optics, the energy of light is quantized, and the quanta (elementary particles) that make up light, we call them light quanta, or photons for short, so they can cause chemical changes in substances such as film photosensitive emulsions.

The principle of photosynthesis is to rely on other ways to take in nutrients, and plants are a type of so-called autotrophs. For green plants, during sunny daylight (when the light intensity is too strong, the stomata of the plants will close, resulting in a decrease in photosynthesis intensity), they use the sun's light energy to photosynthesize to obtain the nutrients necessary for growth and development.

Green plants use light energy to assimilate the carbon dioxide and water they absorb into organic matter. The light reaction can only be carried out under light conditions, while the carbon reaction can be carried out as long as the carbon reaction conditions are met. That is, the carbon reaction does not have to be carried out in dark conditions.

The study of photosynthesis plays a fundamental guiding role in agricultural production, environmental protection and other fields. Knowing the influencing factors of light reaction and dark reaction can take advantage of the advantages and avoid the disadvantages, such as building greenhouses to speed up air circulation to increase crop yields. It is also known that ribulose bisphosphate carboxylase catalyzes both photosynthesis and photorespiration, and attempts are being made to modify it to reduce the latter, avoid the consumption of organic matter and energy, and increase crop yields.

The purpose of agricultural production is to obtain higher yields with fewer inputs. According to the principle of photosynthesis, changing certain conditions of photosynthesis and increasing the intensity of photosynthesis (referring to the amount of sugar produced by plants through photosynthesis per unit of time) are the main measures to increase crop yields. These conditions mainly refer to light intensity, temperature, CO2 concentration, etc.

How to regulate environmental factors to maximize the intensity of photosynthesis is a major issue in modern agriculture.

Examples of agricultural applications include: reasonable dense planting, three-dimensional planting, appropriate increase of carbon dioxide concentration, appropriate extension of light time, reduction of atmospheric electric field shielding, establishment of space electric field, etc.