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A photon or light particle that comes from the sun has a certain amount of energy. Blue photons for example have an energy of 0.4 aJ. Red photons have half that energy.
If a photovoltaic cell is built, a certain energy band gap is chosen. If it is too large, a photon will not be absorbed, if it is too small, part of the energy is lost.
For instance if a photon of 0.4 aJ hits a solar cell of 0.3 aJ band gap, it will be absorbed and create an electron with energy 0.3 aJ. This gives an efficiency of 75%. If a 0.2 aJ photon hits this solar cell it will not be absorbed. Of the total energy of 0.6 aJ hitting the solar cell only 0.3 aJ is absorbed, a total efficiency of 50%.
The highest efficiencies are reach with solar cells that contain several layers with different (decreasing) band gaps.
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∙ 12y ago
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The trees cell will get energy from food and water.
Why cant cells be seen with the naked eye?
Blind
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it cant make energy it is kinetic if it flows
Which of the cells has fixed shape?
Cells with a cell wall.Because cell wall stiff shape cant be changed.
What may producer cells be capable of doing because of additional parts?
it cant
How can you increase the use of geothermal energy?
no it cant, because it is from the sun, and we cant control the suns heat
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The trees cell will get energy from food and water.
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Actually you can. A photovoltaic cell (a.k.a. solar panel) does precisely that.
Can a solar panel work if there's no sun?
No Solar panels do not work if the sun is not out the photovoltaic cells that make up a solar panel require sunlight to produce electricity not to say that you cant have a battery that gets charged up to use during the night.
Can volcanoes erupt because of the suns heat?
no they cant, it erupts because of the build-up of pressure
What energy chance happens in your eyes in a light or dark environment?
Your eyes switch receptor cells from mostly cones to rods, which is why you cant see color in the dark.
What in plants make food but animals cant?
This is because chlorophyll in the plants allow them to absorb the suns energy and turn it into sugar through a process called photosynthesis. Animals do not contain chlorophyll within their bodies therefore they are not able to produce these sugars.
Why cant people with sickle cell do a lot of exercise?
Exercising cost lot of energy.So Oxygen requirement increase.People with sickle cells, do not have normal number of blood cells to carry Oxygen.So energy production would not be sufficient.
How do energy dies?
It cant
What can guard cells do that other epidermal cells cant?
they can save other chloraplasm
Downside of solar energy?
solar energy sucks u cant put a flowmaster on solar energy sucks u cant put a flowmaster on
Could people live if they have no cells?
no they cant
