The current flows through the circuit since the temperature of the two junctions are different. IR Sensor -This device emits and/or detects infrared radiation to sense a particular phase in the environment. Generally‚ thermal radiation is emitted by all the objects in the infrared spectrum. The infrared sensordetects this type of radiation which is not visible to human eye. Touch
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wrong type of cell for that area of the body. This is what we call a tumor. If this tumor begins to spread to other areas of the body it’s diagnosed as cancerous. Many studies have been performed to try to prove that cell phone electromagnetic radiation‚ in the form of radiofrequency‚ can indeed damage DNA. In the document “Cell Phones and Cancer Risk‚” from the National Cancer Institute‚ it states that: “The results of these studies have generally not provided clear evidence of a relationship
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band divided 79channels (1mhz=1600t/s) Quantum energy of microwave photons is in the range 0.00001 to 0.001 eV Human body transparent to microwaves Quantum States: Molecular rotation and torsion Quantum million times lower than X-rays(ionizing radiation=damage) Radio astronomy 30ghz – 1Thz Infrared(IR)- “infra” – below‚ Region of spectrum‚ Below the visible red. Used: Tracking‚ Night vision‚ remote controls FarInfrared(FIR) – LF portion of IR‚ waves are thermal‚ penetrates skin cells NearInfrared
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Test# 2 Name: Group: | |Question text |Criteria | |Q1 |[pic] | | | |Where I0 is the initial intensity of photons and [pic] is the linear……………..which describes the fraction of beam of ………rays or |
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of these differences beta particles can move through paper while alpha particles can’t. Why are gamma rays so dangerous? Gamma rays have the highest penetration ability of the three types of particles. The other two particles can cause cancers or radiation burns on the skin. Because of the gamma rays high penetration it can cause damage throughout the body and is a higher cancer risk. Student 6 page 2: High Not Achieved What are nuclear fuel elements? Nuclear fuel elements are made of uranium oxide
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Ms. Wilson Chem‚ Blk 10 31 October 2012 Atomic Emission Spectra Lab Atomic spectroscopy is the determination of elemental composition by its electromagnetic or mass spectrum. An arrangement of all wavelengths of electromagnetic radiation is called the spectrum; the plural being spectra. As light passes through a prism‚ the frequencies of light emitted by an element separate into separate lines to give the atomic emission spectrum of the element. There are two spectrums in the lab: the incandescent
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in space—instead of bullets. This explains how rainbows work. In fact‚ light is both. This "wave-particle duality" is one of the most confusing—and wonderful—principles of physics. Light is radiant energy‚ usually referring to electromagnetic radiation that is visible to the human eye‚ and is responsible for the sense of sight.[1] Visible light is usually defined as having a wavelength in the range of 400 nanometres (nm)‚ or 400×10−9 m‚ to 700 nanometres – between the infrared‚ with longer wavelengths
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measure the amount of radiation evolved and graphical interpretations did allow calculation of the half-life. Experimental: The counter was measured in the background Beta-radiation count for five minutes. The readings were recorded in the prepared table. The activity of the standard Beta-emitter was recorded and measured for five minutes. The activity of the unknown Beta-emitter was recorded and measured for five minutes. The activity of the standard for the background radiation. Subtracted the
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predict when a particular radioactive nucleus will emit this energy but a large number of materials are said to have a ‘half life’. The half life is the time it takes for half the nuclei to emit their radiation. 1. Describe and compare the nature of emissions from the nuclei of atoms as radiation of alpha α and beta β particles and gamma γ rays in terms of: (6) Ionising power Penetrating power Effect of magnetic field Effect of electric
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NATIONAL SENIOR CERTIFICATE EXAMINATION NOVEMBER 2008 PHYSICAL SCIENCES: PAPER I Time: 3 hours PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY 1. This paper consists of: • a question paper of 17 pages • a data and formula booklet of 3 pages (i – iii) Please make sure that your question paper is complete. 2. 3. 4. 5. 6. Remove the pages of data and formulae from the middle of this question paper. Use the data and formulae whenever necessary. Read the questions carefully. In Question 1 answer 1
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