Sun Meter Monitor

Sun Meter Monitor

physics question: about batteries?

an environmental monitoring station is battery powered. assume that one fresh LongLife 1.35 V cells stores 1.5 KJ of useable electrical energy before its output drops below an acceptable value. two such cells are connected in series to provide 2.7 volt. the monitoring station requires a current of 12 mA.
a) how many seconds will the batteries last, assuming no internal resistance?

to enable the station to run without maintenance, a solar electric panel is installed. data provided for the solar panel installation in that particular location indicates:
- 7% of the sun's energy reaching the panel is converte to electricity
- in this location the mean solar energy per day onto 1 square meter (allowing for the season and typical weather patterns) is 12 MJ.
b) what total electrical energy is produced per day if the solar panel has effective photovoltaic area of .20 m x .25 m.
note; efficiency = energy output/total energy used

Power = voltage x amperage = violts x current = P = V I

Energy = Power x time of operation = E = P t

So time is t = E/(V I)

Now you have two batteries with a total of 3 kJ on energy, V = 2.7 V and I = 12 mA. Plufg into above to get time in seconds making sure you convert mA to Amps (1 mA = 10^-3 A)

Solar panel: Area = 0.2 x 0.25 m^2 = 0.05 m^2

Energy on solar panel = 12 MJ/m^2 * 0.05 m^2 = 0.6 MJ

Panel is 7% efficient so energy produced by panel = 0.07*0.6 MJ = 0.042 MJ = 42 kJ

Battery Monitor Battery Monitor-12 Volt Meter $71.94 Battery Monitor Battery Monitor-12 Volt Meter This panel features an expanded scale, simplified color band meter for accurate battery condition of two separate batteries. Operation is controlled by a 3 position rocker switch, allowing independent testing of either battery. Comes complete with instructions and basic mounting hardware.

SUN MONITOR TO SERVSWTCH MULTI HD15M 13 $49.99 SUN MONITOR TO SERVSWTCH MULTI HD15M 13

Sun System Handheld Par Meter: J $297.46 Sun System PAR Meter comes with an integrated sensor to measure photosynthetic active radiation (PAR). Use inside with Sun System grow lights or outside with natural sunlight. Simple and easy to use. Compact size with integrated sensor. 1 year warranty. Sun System PAR Meter with remote sensor measures photosynthetically active radiation (PAR). Use inside with Sun System grow lights or outside with natural sunlight. Simple and easy to use. Compact size with remote sensor. 1 year warranty.

Tri-Meter Continuous Monitor (EC/pH/Temp) #204: J $198.01 This meter gives you the ability to monitor pH level, Nutrient Levels in EC and Nutrient Temperature. This continuous monitoring system requires no batteries, just plug it in to an AC wall receptacle and the meter will remain in a calibrated mode for months. The Nutradip® Tri-Meter, with automatic temperature compensation, is the best way of measuring the strength of nutrients in your water, pH, and monitoring temperature at the same time. 2 year limited warranty on meter. 6 month limited warranty on the probe.

Tri-Meter Continuous Monitor (PPM/pH/Temp) #202: J $198.01 This meter gives you the ability to monitor pH level, Nutrient Levels in PPM and Nutrient Temperature. This continuous monitoring system requires no batteries, just plug it in to an AC wall receptacle and the meter will remain in a calibrated mode for months. The Nutradip® Tri-Meter, with automatic temperature compensation, is the best way of measuring the strength of nutrients in your water, pH, and monitoring temperature at the same time. 2 year limited warranty on meter. 6 month limited warranty on the probe.

Close Up of a Lace Monitor Relaxing in the Sun $39.99 Brooke Whatnall Close Up of a Lace Monitor Relaxing in the Sun - Photographic Print

Sun System Handheld Par Meter W/ Detacable Sensor: J $382.46 Sun System PAR Meter comes with an integrated sensor to measure photosynthetic active radiation (PAR). Use inside with Sun System grow lights or outside with natural sunlight. Simple and easy to use. Compact size with integrated sensor. 1 year warranty. Sun System PAR Meter with remote sensor measures photosynthetically active radiation (PAR). Use inside with Sun System grow lights or outside with natural sunlight. Simple and easy to use. Compact size with remote sensor. 1 year warranty.

Actress Donna D'Errico Promoting Baywatch Sun Monitor $79.99 Dave Allocca Actress Donna D'Errico Promoting Baywatch Sun Monitor - Premium Photographic Print

Advocate MPSADTD Talking Meter/Blood Pressure Monitor $72.44 The Advocate Duo system is both a talking blood glucose and blood pressure monitor. It speaks for you in either English or Spanish. A small blood sample size of 0.7 microliters is all that is needed. Uses wrist to test your blood pressure. Built in blood pressure monitor Uses wrist to calculate blood pressure. The most unique feature on this monitoring system is the speaking function. The monitor will speak in English or Spanish. Capillary Action. Alternative Site Testing People are able to use other parts of the body other than the fingertips to check their blood glucose levels. You can use the palm forearm the upper body the calf or the thigh. Tiny sample size of only 0.7 microliters are needed. Large screen for easy visibility. 450 test memory. Computer downloadable. Contains: Advocate Duo Talking Two in One System Owner s Manual Quick Reference Guide Warranty Card Carrying Case

HydrofarmLight Meter $60.26 Light Meter. But of that light reaching the plant, only specific types of energy (in the lighting spectrum) drive the photosynthesis process. Since light is the most important single factor affecting your plants' life cycles, quality light meters are an essential tool in determining accurately if your crop is receiving the maximum light needed for healthy growth. A light meter allows commercial growers an accurate means of adapting to their plants' needs as the light conditions change during a full growing season. Identify best light level of healthy plants. Easy to use hand-held design. Get precise reading with two scales. Includes instructions and "Consumer's Guide to Light Gardening" brochure. Lifetime silicon sensor - no batteries required. Read up to 5000 footcandles of sun, high intensity or fluorescent light. Exclusive "Zero" calibration feature - accurate to 2%. Full two year warranty.Set includes (if a set): N/A*Materials: Plastic/Metal *Capacity: Variable*Instructions: Included*Dimensions: 3.5in L x 2in W x 1.5in H*Due to the nature of this product we do not accept returns.

Medicus Power Meter $69.95 Medicus Power Meter Speed equates to distance and distance means less strokes to the green! The Medicus Power Meter allows you to increase your clubhead speed through precise monitoring during training and actual game play. See immediate and accurate results consistently with each swing you take. With the Medicsu Power Meter you can monitor your progress and fine tune your stroke to achieve the perfect amount of power required to help get the ball farther down the fairway. The Medicus Power Meter works on all woods irons and is specifically designed to tightly fit on any shaft size.

Calibration Box For Rudder Meter $100.94 Calibration Box For Rudder Meter The Ruddermaster is an economical steering aid and rudder position monitor. The system is able to perform the dual function of a steering aid and a system monitor for constant rudder angle indication. Kits come complete with meter, calibration box, and sending unit MK445, MK5, and MK6 operate on all standard voltages, 6, 12, 24 and 32V DC MK2 and MK3 models are backlit and water resistant

Rudder Indicator-Panorama Meter $424.94 Rudder Indicator-Panorama Meter The Ruddermaster is an economical steering aid and rudder position monitor. The system is able to perform the dual function of a steering aid and a system monitor for constant rudder angle indication. Kits come complete with meter, calibration box, and sending unit MK445, MK5, and MK6 operate on all standard voltages, 6, 12, 24 and 32V DC MK2 and MK3 models are backlit and water resistant

2.5 Fully Automatic Sun Visor Mount Monitor $80.94 The SecurView SV-9140.VM is a clip-on style monitor that mounts to the sun visor of your vehilce in seconds with no major tools requires and without having the remove the sun visor. The monitor has a built-in 2.5" LCD screen and is completely motorized. When the vehicle is shifted into reverse, the monitor with automatically lower into viewing position and will automatically raise back up when shifted out of reverse. .Even after the visor monitor is clipped into place, the driver can still maintain full use of their sun visor without causing any conflicts.The SV-9140.VM can be used with any of the SecurView or PlateCam cameras or any other camera that uses an RCA cable video connection.

CamelBak Flow Meter $22.5 DECENT FEATURES of the CamelBak Flow Meter Gauges how much water you drink - and how much is left in your reservoir Programmable interface lets you set and monitor personal hydration goals Fits any CamelBak reservoir Includes: Fluid Sensor - Display - Battery - Installation and operating instructions

Huge Monitor Lizard in Indonesia

Importance And Threats Of Ionizing Radiations

Radiation takes many forms, including both electromagnetic waves and sub-nuclear particles. The electromagnetic spectrum consists of light waves ranging in length from very short (10−16 meters) to very long (108meters). The product of the velocity of electromagnetic waves and their wavelength is a constant equal to the velocity of light, 3 × 108 meters per second (m/s); therefore, as the length of a wave increases, the frequency decreases. Thus, if the waves were 1 meter long, the frequency would be 3 ×108 hertz (Hz) or 300,000,000/s (meaning 300,000,000 light waves would pass by each second). The electromagnetic spectrum consists of light waves ranging in length from very short γ (gamma) rays through x rays, ultraviolet (UV) rays, the spectrum of visible light, infrared (IR) rays, and microwaves, to very long radio and television waves.

The shortest electromagnetic waves are classified as γ rays. One of the forms of energy emanating from natural sources of radioactivity here on Earth and also from energy sources in space, γ rays can be thought of as very short x rays. Discovered by the German physicist Wilhelm Conrad Röntgen in 1895, the remarkable penetrating effect of rays and x rays results from their very short wavelength (from about 10−12 to 10−8 meters). The waves are so small that they can pass through many substances with little interaction. X rays pass through skin and organs with little effect but are diffracted somewhat when they pass through denser materials such as bone; the resulting pattern enables technicians to make x ray images of bones and of the contents of packages in airport scanners.

In 1901 Wilhelm Conrad Röntgen (or Roentgen) was awarded the first Nobel Prize in physics, in recognition of the extraordinary services he has rendered by the discovery of the remarkable rays subsequently named after him." The "remarkable rays" Röntgen called x rays (for want of a better name), but in Germany they very quickly came to be called Röntgen rays. A very shy man, Röntgen declined to give the customary acceptance speech at the awards ceremony.

The energy of electromagnetic radiation is directly proportional to the frequency. Since both x rays and γ rays have very high frequencies, they carry large amounts of energy, and high intensities of x rays and γ rays can damage many materials (including living tissue). The rays may be focused by special lenses and used to kill cancer cells or organisms that might cause disease or hasten spoilage in food.

Bonds between atoms in chemical compounds vibrate at characteristic frequencies. Some molecules possess bonds capable of absorbing electromagnetic energy, causing the bonds to bend, stretch, or vibrate and sometimes break. Certain bonds in particular (e.g., that between carbon and oxygen atoms) capture energy at specific frequencies of IR radiation, allowing technicians to use instruments called spectrophotometers to detect the presence of these bonds in chemical compounds. UV, visible, and IR spectroscopy are tools that permit chemists to readily identify and characterize small amounts of chemical substances.

Most animals, including humans, have visual receptors that detect light in the visible spectrum ranging from 400 nanometers for red light. (A nanometer equals 10−9 meters.) Just below the visible spectrum lies UV light ranging in wavelength from about 10 to 400 nanometers. UV light is more energetic than visible light; UV radiation in the sunlight can damage molecules in the skin and is the cause of sunburn. Green plants carry out photosynthesis by using chlorophyll molecules that readily capture light energy in the visible spectrum.

Microwave radiation consists of electromagnetic waves somewhat longer than infrared waves (from about 10−3 meters to 1 meter long) and having a lower frequency, ranging from about 1,000 to 300,000 megahertz (MHz). Waves in this range are readily absorbed by bonds in water molecules. Microwave ovens take advantage of the fact that foods usually contain large amounts of water, and dishes do not. The waves of IR or microwave radiation are usually too long to pass through the small holes in the doors of microwave ovens; thus, one can use a microwave oven to heat food without heating the dish or being harmed by the radiation. Magnetron tubes generate radiation that can be used for radar or for the microwave transmission of electronic signals.

An immense amount of radiation passes undetected through the environment. Our surroundings contain large amounts of radio waves, generally from one to thousands of meters long. X rays also pass through us and the space around us with little effect. From time to time, fears have been raised concerning the electromagnetic radiation emanating from power lines, cathode ray terminals such as television sets and computer monitors, and the earphones of personal transistor radios or CD players, but there is little actual evidence of injury or illness from low intensity radiation. However, workers have been injured or killed by high intensity microwave radiation, and technicians working with radioactive materials must take special precautions.

Much radiation arrives on Earth from the Sun, and some of the energy of this radiation exists in the form of UV light. UV light waves can damage skin and would be much more hazardous were it not for the layer of ozone that exists in Earth's upper atmosphere. In a process known as the Chapman cycle, UV radiation splits oxygen molecules in the stratosphere to form free oxygen atoms. Some of these atoms combine with oxygen molecules to form ozone molecules. The ozone molecules are especially sensitive to UV radiation; the absorption of UV photons converts the ozone back into oxygen atoms and oxygen molecules.  

In recent years the amount of 0zone in the stratosphere over the South Pole has decreased periodically, resulting in an ozone "hole" in the atmosphere. The decrease is most pronounced during the summer months of the Southern Hemisphere. If the amount of ozone continues to decrease, more UV light will reach the surface of Earth, probably causing some skin damage and increasing the incidence of cancer. Chlorine atoms react with and destroy ozone.

Increasing atmospheric amounts of chlorine atoms or free radicals probably result in the destruction of ozone; the source of the chlorine atoms is thought to be synthetic substances known as chlorofluorocarbons (CFCs). Some CFCs may be released from air-conditioning equipment or aerosol spray cans, and some may result from the production of plastic foams. Several international agreements, including the Montréal Protocol of 1987 and the Copenhagen amendment of 1992, have been established to limit the production of CFCs.

Although many forms of electromagnetic radiation exist, special consideration is often given to radiation from unstable (radioactive) atomic nuclei. This radiation is usually one of three types, α - and β -particles or γ rays, but some nuclear reactions may also result in the emission of neutrons. α -particles are relatively large and highly charged particles identical with the nuclei of helium atoms. Each has a mass of four atomic mass units (AMU) and a charge of +2. Radioactive ores containing sources of α -particles often produce helium gas as a result of the capture of electrons by the alpha, α -particles. Beta, β -particles are high-speed electrons, having a mass of about 1/1,800 amu and a charge of −1. Gamma, γ rays are similar to x rays.

X rays, γ rays, and neutron beams are considered ionizing radiation. Ionizing radiation may break molecules into pieces, creating ionic free radicals that can be very damaging to tissue. Contaminated food or dust containing radionuclides that emit α - and β -particles may be very dangerous if the sources of radiation are ingested. Strontium-90 (90 Sr) present in fallout from nuclear weapons testing may be absorbed from soil, incorporated in plant tissues, eaten by cows, and eventually find its way into milk. Strontium is chemically similar to calcium. The 90 Sr may then be absorbed from the digestive tract and deposited in bone, where α -particles released by radionuclide decay damage the blood-producing reactions in bone marrow.

Several methods are used to detect radiation; the earliest of these, also discovered by Röntgen, is exposure of photographic film. Since x rays can pass through solid materials, they expose photographic film sealed in lightproof envelopes. Workers in industrial settings today often wear film badges that contain a sheet of photographic film inside a plastic container fitted with aluminum and lead shields. In order to determine the amount and type of radiation exposure, the badges are collected periodically and the film developed. Darkening of the film indicates exposure. Workers may also wear dosimeters, pencil-like tubes that are examined daily for exposure. For large-scale operations or as survey monitors at factory gates, Geiger-Mueller counters are utilized. These devices detect radiation by using a tube consisting of a metal can containing a charged wire. The tube is sealed with a thin plastic or mica window. Radiation penetrating the can or window ionizes molecules of gas inside the tube, and the ions allow an electrical discharge, which can be detected and registered by an electrical circuit. Civil defense and military personnel often carry Geiger counters to survey large areas for contamination by radioactivity.

Radiation is a versatile tool for the diagnosis and treatment of disease, as well as a means of industrial testing and treating foods to avoid spoilage. Many common metabolic substances can be labeled by replacing atoms such as carbon or hydrogen with radioactive atoms such as 14 C or 3 H. The resulting molecules are absorbed by the body and react in the same way as nonradioactive molecules, but the decay of the radioisotope releases tiny amounts of radioactivity that can be detected with sensitive instruments. Some compounds are absorbed more rapidly by diseased tissue (a cancerous organ, for example, might rapidly absorb glucose from blood), and the use of substances such as radioactive iodine can help diagnose tumors of the thyroid gland without invasive surgery. Some diseases such as cancer can be treated by administering a preparation containing radionuclides within molecules that are taken up by an organ and release their radioactivity within the diseased tissue.

Cells that are growing and dividing rapidly are the most sensitive to radiation. In the human body, these include gonadal tissue, hair follicles, the immune system, bone marrow, intestinal epithelium, and cancer cells. Cancer may be treated by external beam radiation, using γ -type radiation to deliver energy to abnormal cells, in the hope of killing them. Normal tissues are protected by lead shielding, and also by rotating the radiation source, passing the beam of rays through a larger range of tissue, and avoiding the intense irradiation of nontumorous tissues. In some cases, malignant cells can be treated with brachytherapy, the implantation of tiny metallic seeds containing radioisotopes that emit small amounts of radiation, killing the cancer from the inside. Radioisotopes decay at a known rate; often a nuclide that decays rapidly may be chosen, allowing the patient to be radiation-free upon discharge.

Gamma radiation is widely used in manufacturing to make images of welds in pipes. A recent application of radiation in the food industry involves the use of radiation (usually either γ rays or high-energy beams of electrons) to irradiate food, killing organisms that cause spoilage. The irradiation of food presents several advantages: foodstuffs may last weeks longer with little refrigeration; the use of dangerous chemical preservatives can be avoided; and foods may be prepared, wrapped, and preserved with less contact by human workers, lessening the chances of spreading disease-producing organisms. In recent years, especially virulent and damaging strains of Escherichia coli have caused outbreaks of illness among persons who consumed contaminated hamburger, and some cases of salmonella poisoning have been associated with the consumption of poultry products. Food irradiation may help to make such foods much safer.

Our environment contains many sources of radiation, such as cosmic rays that constantly bombard Earth. The atmosphere filters out some cosmic rays, so exposure is greater at higher altitudes than at sea level. Radiation sources also include smoke detectors, luminous watch dials, television and computer monitors, and medical x rays. We are exposed daily to electromagnetic radiation in the form of radio waves as well as α - and β -particles and γ rays emanating from radioactive carbon, hydrogen, and potassium, which are part of all living things. A small amount of radiation is probably harmless and may, in fact, be helpful. Radon in our homes is a potential cause of cancer. Although radon is a colorless, odorless gas, it decays to more chemically reactive and radioactive products that may bind in lung tissue. Like many dangerous gases, radon is much more hazardous in the presence of particulate matter such as the tiny particles present in cigarette smoke.

About the Author

Dr. Badruddin Khan teaches Chemistry in the University of Kashmir, Srinagar, India.

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