of light. There are two common types of materials used to manufacture the photoconductive cells. They are Cadmium Sulphide (CdS) and Cadmium Selenide (CdSe). Extrinsic devices have impurities added‚ which have a ground state energy closer to the conduction band since the electrons don’t have as far to jump‚ lower energy photons (i.e. longer wavelengths and lower frequencies) are sufficient to trigger the device. Two of its earliest applications were as part of smoke and fire detection systems and
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Homeostasis literally means “same state” and it refers to the process of keeping the internal body environment in a steady state‚ when the external environment is changed. The importance of this cannot be over-stressed‚ as it allows enzymes etc to be ‘fine-tuned’ to a particular set of conditions‚ and so to operate more efficiently. Much of the hormone system and autonomic nervous systems is dedicated to homeostasis‚ and their action is coordinated by the hypothalamus. In Module 2 we saw how
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HSC OPTION: SPORTS MEDICINE How are sports injuries classified and managed? * Ways to classify sports injuries * Direct and indirect * Direct injuries are sustained from an external force causing injury at the point of contact‚ e.g. a hockey player receiving a bruise from being struck on the leg by a stick during a game. * Indirect injuries usually involve the athlete damaging the soft tissues such as the ligaments‚ tendons or muscles of the body through internal or external forces
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Weather Effects on Aviation Infrared Systems Embry-Riddle Aeronautical University Abstract Infrared (IR) systems utilize electromagnetic energy of specific wavelengths emitting from bodies to accomplish an end goal of the system (Smith‚ 2005). Examples of these goals in aviation are imaging‚ detection‚ tracking‚ and targeting. Infrared systems are also used in other aviation areas such as weather equipment or air to ground targeting systems‚ but this paper will focus on systems specifically
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various methods used to protect sensitive crops from damaging low temperatures? Explain why each method works. Various methods to help protect sensitive crops include: a. Orchard heaters – “smudge pots” help warm air around the trees by setting up convection currents close to the ground. b. Wind machines – power driven fans which resemble plane propellers that mix cold air at ground level and warm air from higher up resulting in increasing the air next to the ground. c. Irrigation – on potentially cold
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solar energy for s1. To reduce the heat losses‚ a 2 cm thick layer of glass-wool was placed between the absorber tray and outer cabinet. A single pane transparent float glass of 0.3 cm thickness and 151 70 cm2 was used for glazing to allow the solar radiation inside the SAH. The single glazing has been considered effecting elements of the system like as halogen lights‚ inside wall of ducts for good reflection‚ and mainly the absorber tray are required to be very clean while performing (a float glass
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What is a light year‚ how is it used to measure distances in space‚ and why is this unit measurement necessary? What is an astronomical unit‚ how is it used to measure distances in space‚ and why is this unit measurement necessary? How fast can our fastest spacecraft travel? What are the limitations of manned space missions with respect to exploring the universe‚ the galaxy‚ the solar system‚ and other planets? What are the major components of the universe? How do scientists think
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antioxidants to neutralize the solar radiation. It can also increase the production of melanin to naturally protect it. Sunscreen use stops the body’s natural process of creating melanin to protect the skin from sunlight. Sunscreen also prevents the automatic warning to get out of the sun when we sense a burning. Now that we have sunscreen‚ we’re staying in the sun for much longer than necessary‚ which means we are leaving the skin open to damage from the radiation. According to the FDA‚ all sunscreens
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atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth’s gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation. A. Nitrogen - 78% - Dilutes oxygen and prevents rapid burning at the earth’s surface. Living things need it to make proteins. Nitrogen cannot be used directly from the air. The Nitrogen Cycle is nature’s way of supplying the needed nitrogen for living things. B. Oxygen - 21% - Used by all living things. Essential
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The nucleus is positively charged because it repels α-particles The nucleus itself is small since very few α-particles are deflected are deflected by much. α‚ β and ϒ radiation Their properties and experimental identification using simple absorption experiments; applications e.g. to relative hazards of exposure to humans. Radiation Alpha- α Beta- β - Gamma- ϒ Range Ionising Strongly Slow 1m Weakly Fast Follows inverse law Very Weakly Speed of Light Alpha: Beta (-): Beta (+): Gamma: Speed
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