1. This question is about lasers. (a) With reference to the light waves emitted by a laser‚ state what is meant by the terms (i) monochromatic. ........................................................................................................................... ........................................................................................................................... (1) (ii) coherent. ...............................................................................
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origins may not be well known include Viagra‚ potato chips‚ brandy‚ the microwave‚ Teflon‚ and the artificial sweetener cyclamate. There have also been many important discoveries made in the world of medicine‚ including penicillin‚ insulin‚ and the X-ray. Insulin‚ though not a cure‚ has saved millions of lives and will continue to help those who suffer from diabetes. Insulin‚ a hormone which regulates the body’s blood sugar‚ is comprised of a simple protein of 2 amino acid chains. Insulin regulates
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Mars is Heaven!From Wikipedia‚ the free encyclopediaJump to: navigation‚ search "Mars is Heaven!" Author Ray Bradbury Country USA Language English Genre(s) Science fiction short story Media type Print (Magazine) Publication date 1948 "Mars is Heaven!" is a science fiction short story by Ray Bradbury originally published in 1948. "Mars is Heaven!" was among the stories selected in 1970 by the Science Fiction Writers of America as one the best science fiction short stories of all
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look at the image this “portrait” provides‚ it’s a little less than conventional. An X-ray is essentially a picture of a person’s skeleton‚ and skeletal figures are a big aspect of the Mexican Day of the Dead holiday. During this day‚ family and friends get together to pray for and remember their passed loved ones‚ and provide food and drinks to help support their spiritual journey. Hans draws up Clavdia’s x-rays as he sees her ride away in a sleigh‚ which are known to be used in the sanatorium to
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X-rays and Ultrasound: X-rays and ultrasound are two different modalities used for different things‚ so an ultrasound can do some things an X ray cannot‚ and vice versa‚ and so this makes them very difficult to directly compare. Ultrasound: Above: An ultrasound machine. Ultrasound is the use of energy generated by sound waves of 20‚000 or more vibrations per second. Ultrasounds are generated by a device called a transducer. Bearing in mind that sound is a mechanical energy‚ the transducer
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PERSONNEL PROTECTION * Primary X-Ray Beam * Emerges directly from the x-ray tube collimator. * It moves without deflection (toward a wall‚ door‚ viewing window‚ etc). * Primary radiation is also known as direct radiation. * Secondary Radiation (aka Scatter radiation & Leakage Radiaiton) * Scatter Radiation – results whenever a diagnostic x-ray beam passes through matter. * Compton interactions between the x-ray photons and the electrons of the atoms
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temperature. At room temperature around 34C‚ the solubility was found to be 92.41 gm/50 ml. The FT-IR spectroscopy was performed on pure zinc sulphate crystals to identify the presence of functional groups. The grown crystals have been subjected to powder X-ray diffraction to determine the unit cell dimensions and the crystal structure. The lattice parameters are found to be‚ a = 9.9810 Å‚ b = 7.2500 Å and c = 24.2800 Å‚ respectively. The values were in good agreement with those of the reported values. The
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LIMITATION OF SIGHT AND HEARING INTRODUCTION Humans have sight and hearing limitation. Without any devices‚ our sight and hearing was limited. Most of the limitation of sight can be overcome with the help of certain optical instruments such as magnifying glass‚ microscope‚ binoculars and others. The range of frequency of hearing in human 20 Hz to 20 000 Hz. It was different according to the age of a person. Hearing limitations can be overcome by using devices such as microphone‚ stethoscope‚ earphone
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of X-rays performed on children every year‚ kids are more likely to receive X-rays than any other type of imaging exam. A new education campaign seeks to equip parents with the knowledge they need to make informed decisions about their kids and X-rays. Through a series of online teaching materials aimed at parents and medical professionals‚ Image Gently’s "Back to Basics" campaign promotes radiation protection through the use of kid-sized imaging and other measures. "There’s no doubt that X-rays
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Wilhelm Conrad Roentgen was born on March 27‚ 1845 in Lennep‚ Germany to Friedrich and Charlotte Constance Roentgen. When he was three Wilhelm and his family moved to Apeldoorn‚ Nederland. His father owned a thriving cloth business so he was pretty well off. He lived right next to the Kostschool of Martinus Hermanus van Doorn‚ a boarding school with around eighty students‚ which he attended. He was expected after he graduated to go into his father’s business and eventually inherit
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