Chemistry in Photography Background A photograph is an image made by a photo-chemical reaction which records the impression of light on a surface coated with silver atoms. The reaction is possible due to the light-sensitive properties of silver halide crystals. Equation form for silver halides: Ag + + e - Ag Species produced include: Ag2+‚ Ag2o‚ Ag3+‚ Ag3o‚ Ag4+‚ Ag4o In 1556‚ the alchemist Fabricius was the first to discover that light can photochemically react with these crystals to
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converted. The principle behind this is what we call latent heat. It refers to the energy (or heat) required to change the state of a substance without changing its temperature‚ the energy is used in breaking bonds in the structure of the material while changing state. * Explain why steam burns are more painful than boiling water burns. Because the steams contains extra heat energy than boiling water due to its specific latent heat of vaporization. Latent heat of vaporization is the energy given out
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n this study‚ latent growth modeling was used to look at mother’s and infants from 156 families to measure how the temperament in their infant was from 4 to 18 months of age‚ maternal stress‚ depression‚ negative parenting and family demographics. The study was to see what effects any or all have on temperament development. The main temperamental characteristics looked at in the infants‚ was their negative emotions (behavior) and regulatory capacity (response) because these are the main traits of
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In the Journal of Research in Crime and Delinquency “A Latent Class Analysis Of Family Characteristics Linked To Youth Offending Outcomes” written by several authors Grace S. Chng‚ Chi Meng Chu‚ Gerald Zeng‚ Dongdong Li‚ and Ming Hwa Ting focuses on how family backgrounds does matter if a youth becomes an offender. The article focuses on how common family risk factors are related to the outcome of youth offending recidivism. Shows how the family background does contribute to wither a youth turns
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FILM STRUCTURE FILM STRUCTURE What is motion picture film? The American National Standards Institute (ANSI) describes it as “a thick flexible strip of plastic‚ complying with a dimensional standard as defined within‚ whose use is specific to the process of manufacturing a motion picture.” That definition leads to about a dozen pages of further definitions about various aspects of motion picture film. For our purposes‚ let’s take a look at how film is made‚ and how an image is formed on that film. THE
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Birth Defetc s No one is immune to birth defetc s‚ yet not everyone is equally susceptible. Birth defetc s are not merely a medical problem. They have profound effetc s on the social and psychological well being of their family and friends. In the normal course of fetal development‚ cells migrate to their appropriate destination so that organs and limbs form where they should. Usually‚ the genes perform flawlessly‚ but mistakes can and do occur. Some of the most common birth defetc s
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EYE DEFECTSAND DISEASES STRABISMUS: A visual problem in which the eyes are not aligned properly and point in different directions. One eye may look straight ahead‚ while the other eye turns inward‚ outward‚ upward‚ or downward. The eye turn may be consistent‚ or it may come and go. Which eye is straight (and which is misaligned) may switch or alternate. CAUSES:With normal vision‚ both eyes aim at the same spot. The brain then combines the two pictures into a single‚ three-dimensional image
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brackets [ ] at the end of each question or part question. This document consists of 10 printed pages and 2 blank pages. DC (SHW 00444 4/09) 15058/4 © UCLES 2010 [Turn over 2 1 A student performs an experiment to find a value for the specific latent heat of vaporisation of water. An electric kettle‚ half-filled with water‚ is placed on a top-pan balance‚ as shown in Fig. 1.1. electric kettle top-pan balance Fig. 1.1 The kettle is switched on with the lid open. When the water is boiling steadily
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PSC 41- Specific Heat Capacity and Latent Heat Constants: Specific heat capacity ofwater=4180 J Kg-1 K-1 Specific heat capacity of ice=2050 J Kg-1 K-1 Specific heat capacity of copper= 386 J Kg-1 K-1 Specific heat capacity of aluminum=900 J Kg-1 K-1 Latent heat of vaporization of water =2.26x106 J Kg-1 Latent heat of fusion of water = 3.34x105 J Kg-1 Density of water =1000 Kg m-3 Conversion : 1L ≡ 103 g for water 1) A 12.5 g sample of an unknown metal‚ heated to 99.0
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The Methods of Latent Fingerprint Discovery Finding and Retrieving Latent Prints from a Crime Scene Megan M. Anderson Brevard Community College Abstract This paper explores the methods of latent fingerprint discovery the finding and retrieving of latent prints from a crime scene. Here we will review how to find a latent print using alternative light sources and what those light sources are. We will also review the surface characteristics of evidence and the purpose of sequential processing
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