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Define Barrier layer cells (photocells)
They are the very simple of the detectors. It contains the bottom support layer of conductive metal like iron. A photosensitive layer of the selenium /cadmium (the positive electrode) rest on the top of the metal support. This light sensitive materials is covered along with a transparent thin layer of gold (the negative electrode). Light passing by the transparent layer to the selenium, causes the release of electrons from selenium. These emitted electrons move to the clear conductive layer and make a weak electric current as they complete a circuit by flowing to the metal support. So the current produced is a direction function of the light intensity striking the photocell.
Disability evaluations after injuries: (a) Explain the following terms: "duration of disability" and "degree of disability". (b) Explain how degrees of disability after injur
Strengths of Brief Screening Measures 1) Inexpensive, rapid, portable 2) Needs less training in administration and interpretation 3) Differentiating between dementia and
Haemoglobin Among the respiratory pigments we shall consider haemoglobin in some detail as this is the most familiar, widespread as well as the most efficient respiratory pigm
What are the properties og Gels? Polysaccharides, proteins or colloidal complex particles, such as caseinate micelles form gels at levels of 10% or less. Gums, pectin and gela
Why is a weekly acidic drug best absorbed in an acidic environment?
Sound is a main mean of communication and entertainment and is also very effective alarm system for some animal. A loud and unwanted or unpleasant sound causes discomfort and is ca
Q. What is the nitrogen waste in amphibian larvae and in the adult animal? The terrestrial adult excretes urea since amphibian larvae are aquatic they excrete ammonia.
Phototropism - Root and Shoot Morphogenesis Paratonic growth movement of part of a plant in response to light, e.g. bending of stems of indoor plants towards a window, brough
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How does biological diversity relate to the characteristics of the abiotic factors of an ecosystem? The availability of abiotic factors as light, moisture, mineral salts, heat
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