7 Regions of the Electromagnetic Spectrum - 769 Words

The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. There are 7 regions in the electromagnetic spectrum and they are gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves and radio waves. All types of electromagnetic radiation are transverse waves and they all travel at the same speed in a vacuum. The regions of the electromagnetic spectrum are explained below in order of increasing wavelength and decreasing frequency. Gamma Rays (ÃŽ ³-rays) Gamma rays have the lowest wavelength but the highest frequency in the electromagnetic spectrum. They are produced by radioactive atoms in nuclear explosions. Gamma rays are highly penetrating rays and can kill living cells, which due to†¦show more content†¦Ultraviolet was discovered by Johann Ritter. He discover it by using silver chloride and exposing it to the light at the violet end of the spectrum. Silver chloride turns black when exposed to light and it turned black the fastest when placed near the violet end of the spectrum. Visible Light Visible light is the only electromagnetic radiation that is visible to the human eye. We see visible light by the light focusing onto the retina of the eye which creates a visual image in the brain. Visible light is also an essential energy source for plants because they need it when they undergo photosynthesis. Visible light is used in many things such as photography, illumination and also our vision. Infrared infrared comes from heat or thermal radiation and it is produced by the motion of atoms and molecules in an object. infrared is used for heating and cooking and also in thermal imaging devices. Infrared was discovered by a british astronomer called William Herschel. He discovered infrared by using a prism to break up visible light, then he realised that the temperature rose from violet to red (using a thermometer) and then where there was no visible light at the red end of the spectrum, the temperature was the highest. Which this is how he discovered infrared. An advantage of infrared is it can be used to detect people, which it is used by the police to find criminals from a helicopter when they are trying to escape. Also, infrared can be used for manyShow MoreRelated60GHz AN ATTRACTIVE BAND 1.1 INTRODUCTION: In many countries, the frequency range 57-66 GHz is900 Words   |  4 Pagesconditions of use and/or licensing. From a global point of view, the use of this spectrum by Fixed Services (FS) is being addressed by the ITU- R in its draft report on Fixed Service use trends in WP5C, which is currently under development. In 2001, the federal Communication Commission (FCC) allocated 7 GHz in the 57-64 GHz for unlicensed use. The allotted spectra in different countries are shown in the figure. Figure:1.1 Spectrum Allocated in Different Countries The high frequencies are associated withRead MoreThe Effect Of Solar Flares On Our Future Essay1529 Words   |  7 Pagesactive region of the Sun while another set have magnetic fields changing daily within a large active region.3 Seeing these kinds of signs is not a guarantee of a solar flare and even if it were we could not fully known its strength beforehand. Using our previous experience and current incomplete models is the best that we can done now, but research and modeling continue to improve our understanding of solar flares. Solar flares occur in a variety of strengths in terms of energy and broad spectrum outputsRead MoreDocoment, Doc1918 Words   |  8 PagesElectromagnetic waves At this point in the course well move into optics. This might seem like a separate topic from electricity and magnetism, but optics is really a sub-topic of electricity and magnetism. This is because optics deals with the behavior of light, and light is one example of an electromagnetic wave. Light and other electromagnetic waves Light is not the only example of an electromagnetic wave. Other electromagnetic waves include the microwaves you use to heat up leftovers forRead MoreThe Sun : Thermal And Electromagnetic Processes Essay2139 Words   |  9 PagesThe Sun: Thermal and Electromagnetic Processes 1 The Sun: Thermal and Electromagnetic Processes Anthony Valcarcel Tennessee Technological University Link to PowerPoint video: The Sun: Thermal and Electromagnetic Processes 2 Abstract The Sun is the closest star to our solar system, and is more than just a body in the sky;Read MoreAre Cell Phones Dangerous?2205 Words   |  9 Pagespoints and evaluate their arguments I will then give you my own opinion based on the facts and research I have conducted. What is the electromagnetic spectrum? The electromagnetic spectrum is a range of different Electromagnetic radiation. The radiation is energy that travels in waves, the electromagnetic spectrum is what is used to describe those waves. Electromagnetic waves are formed by vibrations electric and magnetic fields. the distance from one point on one wave to the same exact point on theRead MoreThe Degradation Of Solar Cell1003 Words   |  5 PagesSolar Cell Degradation in Space Abstract: This paper will present the degradation of solar cell performance when exposed to solar wind in space, particularly in the Van Allen belt region. Also, solar cell theory is mathematically modeled and described using Matlab simulation software accompanied by the SRIM software to generate the targeting data. Follow with the degradation modeling of Si, InGaP/GaAs/Ge triple-junction space solar cells when are exposed to high energy charged particles, especiallyRead MoreHow Does Hide An Object?3596 Words   |  15 Pagesscattering of the hidden object with the scattering of a background object so that only the scattering of the background object can be detected by an outside observer and the hidden object disappears electromagnetically. Method3: Using Active Electromagnetic cloaking. Literature Survey: Invisibility, which has been a long-time goal, has received many studies with transformation optics (TO), meta-materials and other methods in recent years [1-16]. Readers can get some background on this topic withRead MoreThe Visible Light Communication ( Vlc )1652 Words   |  7 Pagesintensity given off from their screens, detectable at a distance of up to ten metres. The main advantage of Li-Fi is being useful in electromagnetic sensitive areas such as in aircraft cabins, hospitals and nuclear power plants without causing electromagnetic interference. Therefor the communication technique not only helps in solving the problem of lack of enough spectrum space but also enables novel application. 2.1 How Lifi Works †¢ The lamp driver receives data from the internet. †¢ The digital signalRead MoreRadio Frequency Identification ( Rfid ) Essay2037 Words   |  9 Pagesused with money, but there is a main limitation while using RFID technology. It is privacy and security. That is why, Electrical and computer engineers work with this limitation, so RFID would be the future for all engineers. Index-Terms—RFID Electromagnetics, term paper I.INTRODUCTION For many people, using a card to access a building or a door, a key to start a car or validating an underground ticket have become a routine without realizing that they are making use of a technology that capturesRead MoreAbsorption Spectrum Of Conjugated Dyes1574 Words   |  7 Pages Absorption Spectrum of Conjugated Dyes Bashar Baraz Lab Partners: whole class Physical Chemistry II 3/22/2015 Abstract: The highly conjugated system of the cyanine dyes makes it a very good compound in the development of more efficient solar cells. In this experiment, the maximum wavelength was measured for nine dyes using a UV-Vis spectrum. The result that were obtained agreed with Kuhn’s model for the less polarizable end groups such as 3,3 -diethyloxadicarbocyanine and 3,3 -diethyloxatricarbocyanine

Analysis Of Marjane Satrapi s Persepolis And Ta Nehisi...

There is no such thing as an objective reality, since the very notion of an objective truth is impossible for us all to conceive together, and, is, therefore subjective. As such, our reality is a collection of subjective truths woven together like a collage, that ultimately represents what we consider to be true. This theme of a subjective reality is conveyed in both the major motion picture version of Marjane Satrapi’s Persepolis and Ta-Nehisi Coates’ Between the World and Me. Moreover, following the argument that there can be more than a single â€Å"truth,† what should concern the individual shouldn’t be obeying an truth proposed to be objective, but rather adhering to whatever truth best meets their criteria as true. This said, if someone†¦show more content†¦Coates described the world in this light, in his book, a world where subjectivism defined people’s grasp of reality and was the basis for their actions. He attacked the notion of a single â€Å"truth† with his depiction of the United States as a place where some citizens were kept awake by systematic racism and institutional discrimination and prejudice, while the rest were allowed to slumber, living their lives in a dream world. In this â€Å"Dream,† the sins we committed in the past, and continue to this today, such as, the plundering, raping, and destruction of black bodies no longer carry relevance. The â€Å"Dream† would convince us that racism doesn’t haunt America’s legacy any more than your typical natural disaster.(Coates, pg.7) The â€Å"Dream† was nothing more than an illusion, a reality created out of a formula of denial and shame, but still people put their faith in it. Similarly, in the movie Persepolis, Satrapi shows how a state’s claim to an objective truth can greatly contradict with the subjective reality experienced by its own people. During her childhood in Iran, Satrapi grew up in a dictato rship that imposed its own narrative on everyone she knew, and murdered anyone who dared to express their own subjective reality. The contrasting truths that prevailed in Iran are best shown in a scene that particularly stuck out for me, where Satrapi openly rebukes her teacher for attempting to spread a false reality in the classroom

Why i choose college free essay sample

Universities vs. Community Colleges My essay I will be talking about the difference between universities and community colleges. I choose this topic because most students coming out of high school and get stuck on choosing a college to attend. Community colleges have open admissions policies, meaning that anyone who can benefit is welcome to attend. You will need a high school diploma or a GED to take courses for credit. Many non-credit courses are available for anyone who wants to enroll. Students take assessments and placement test to determine the appropriate class level. Four-year colleges and universities vary in their degrees of selectivity and some do have open admissions policies. Some selections is often based on competitive factors such as standardized test scores, such as the SAT and SCT, high school grade point average and coursework, letters of recommendation, and admissions essays. A high school diploma or a GED is generally required in order for an applicant to be admitted. We will write a custom essay sample on Why i choose college or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Community colleges student body s often described as a non-traditional, referring to independent, older adults who are entering college for the first time or returning after some time. Most students are in-state residents from the local area; some foreign-born students also attend. The majority of students attend part time (less than 12 credit hours per semester). In universities many students in baccalaureate programs start right out of high school and in fall into the traditional college-age 18-22 years old. Students come from across the country and around the world. Most students attend on a full-time basis. Community college an associates degree is usually the highest degree awarded. Most degree programs can be completed in 2 years of full-time attendance. Certificate programs typically take a year or less to complete if you go full-time. All universities and four-year colleges offer a bachelors degree as the highest undergraduate degree. Some also offer and associates degree typically takes 4 to 6 years to complete. Community colleges are mainly geared to commuters however; bout 20% of community colleges do offer a more traditional college experience with on-campus housing available to students. Most four year institutions are geared to full-time, residential students with on-campus housing in dormitories widely available. Community colleges faculty members are mainly focused in teaching as the primary responsibility; many community colleges require the faculty to have a masters degree and there are a growing number who also hold doctorates. Universities or four-year colleges faculty members focus is divided among teaching, esearch, and publication; there is a higher percentage of faculty with doctorates than a community college. Community colleges class sizes averages between 25 to 40 students. Classes are taught by full-time or part-time faculty member. Although universities class sizes varies, many lower-division classes, especially lecture classes, can be very large and taught by graduate teaching assistants. Tuition for community colleges is affordable. Tuition costs at public institutions are usually twice that of

The Components of Speech and Language an Example of the Topic School by

The Components of Speech and Language Language is a system of rules employed by humans in communication to convey and share thoughts, emotions and ideas. Language is the capacity to comprehend what is heard and the expression of notions by use of words through speech, signing, gestures, eye blinks or writing. The brain assists in the development of language as well as in its interpretation. Need essay sample on "The Components of Speech and Language" topic? We will write a custom essay sample specifically for you Proceed Language is composed of various elements namely: semantics, syntax, phonology, morphology and pragmatics. Phonology is the study of language speech structures, simple speech unit models and established pronunciation conventions. Phonemes are the basic sounds that constitute a language. For instance, that consists of three phonemes: th, a,t. The study of basic units of meaning is called morphemes. Morphemes comprise of foundation words like hat, love and dog as well as affixes like un-, and re-, past tense as in ed and plurals like s and es. Morphology is crucial in language development and signifies basic structural blocks for understanding. Syntax involves the study of the dynamics of combination of words with their smallest significant units to develop sentences. Comprehension of syntax makes one understand that the following differently-ordered sentences imply the same idea although they are of differing complexity: The boy hit the ball and The ball was hit by the boy. The sentence I went to the store is correct; but to the store I went is not grammatically acceptable (Ritzman, Sanger, 2006, p.265). Semantics is how a language delivers meaning. Semantics is culture-specific and goes beyond literal meanings of words. Knowledge of semantics informs one that being green with envy doesnt imply color change. Pragmatics refers to how communicators attain their goals by use of language. Different audiences call for different speech patterns; for instance, conversation styles when dealing with parents, friends, toddlers and siblings differ. Language development is very intense in the initial three years of human development when the brain is enlarging and maturing. Language skills develop best in environments with various sounds, images and continuous exposure to the language and speech of other persons. The maturing brain can absorb any language during this critical period. Initial signs of communication are manifest in the initial few days when an infant realizes that a cry will induce provision of food, company of comfort. The infant starts to identify crucial sounds in their environment. As they develop, infants begin to distinguish speech sounds (phonemes) or structural blocks that constitute words. At six months majority of infants can identify principal sounds of their local language (Murata, 2000, p.524). An infant can make inhibited sounds with the maturation of the speech structures; lips, jaw, tongue and voice. The initial months witness cooing - a quiet, appealing, recurring vocalization. At six months, the infant can repeatedly utter syllables like da, da or ba, ba. This babbling develops into an incomprehensible jargon having the quality and rhythm of human speech but devoid of words. At the close of year one, most children can say a few basic words. At the outset, the kids are oblivious of the meanings of their maiden words; they learn of the implications of the words when others react to them. At eighteen months, majority of toddlers can utter eight to ten words. At two years, majority can crudely join words into sentences like more milk. They rapidly realize that objects, thoughts and actions are symbolized through words. Children also participate in mock or representational play activities. The ages three, four and five usher in accelerated vocabulary build-up and mastering of the conventions of language by children. Inpidual children follow different language development patterns. A conventional language-attainment progression exists with milestones- observable skills that act as a guide to regular development. The milestones are categorized based on the ages of children. milestones include: Birth to five months, 6-11 months, 12-17 months, 18-23 months, 2-3 years, 3-4 years, 4-5 years, five, six, seven and eight years (Murata, 2000, p.529). At six months, a toddler can vocalize with accent and reacts when their names are called out. The infant reacts to human voices with no visual hints by moving eyes and head. They can fittingly react to either cordial or irate tones. At twelve months, the infant can utilize one or more meaningful words or a portion of a word. The toddler can also comprehend basic instructions if supplemented with verbal or physical cues. The child understands the social worth of speech. By eighteen months, the childs vocabulary numbers 5-20 words, mainly comprising of nouns. They exhibit echolalia; the repetitive uttering of a word and a lot of emotional jargon. They can track basic guidelines. At age two, children can name several items present in their environment. They can utilize at least two prepositions among in, on, under. They can join words into simple sentences mainly comprising of nouns and verbs. They can utter about 67 percent intelligible content and possess 150-300 words vocabulary. The pace and fluency of speech is not well developed with disorganized voice pitch and capacity. Three pronouns, I me and you, are properly used though I is confused with me. The child starts to use my and mine and can react to the command show me your nose (Ritzman, Sanger, 2006, p.271). By the time they are 36 months old, children correctly use the pronouns you and I, several past tenses and plurals and are familiar with at least three prepositions like on, in and under. They recognize and can point out main body organs. They can easily manage three-word sentences and have a vocabulary base of 900-100 words. The use of verbs is predominant. They can comprehend basic queries on their environment and actions and coherently narrates experiences. The kid can answer questions like what one must do when hungry, cold, sleepy or thirsty. They can state their age, gender and names, though they dont usually answer all queries even though they have the answers. At age two, the kid comprehends names of popular animals and can show meanings of at least four prepositions by employing them in sentences. They can name usual items in books or magazine pictures and are familiar with one or more colors. The child can repeat 4 slowly issued digits as well as four syllable words. They can show their comprehension of over and under. The child is aware of most vowels and diphthongs as well as the consonants p, b, m, w, n. They frequently participate in make-believe and perform in-depth verbalization as they perform their activities. They comprehend the contrast notions of larger and longer. Basic commands are adhered to promptly even in the absence of physical stimulus (Ritzman, Sanger, 2006, p.276). At 60 months of age, kids can simultaneously use descriptive adjective and adverb words and are aware of basic opposites like: heavy-light, hard-soft and little-big. They can count up to ten and have number notions amounting to four or more. Speech is fully intelligible with slight articulation hindrances. All consonants (p, m, h, b, k, w, t, g, n, d, ng, y) and vowels are known. The kid can recap as long as nine-word sentences. They can explain usual items based on their uses, for instance, chair, hat and shoe. Kids can adhere to three commands issued in succession are aware of their ages. Basic time notions, for example, afternoon, morning, day, night, later, after, tomorrow, today, yesterday, and while, are well understood. They can utilize quite long, compound and complex sentences. Speech is generally grammatically sound. By age six, children have added the consonants f, sh, v, th, zh, to their vocabulary. Speech is completely logical and socially important. They can relate a connected story about a diagram emphasizing linkages between items and events. At age seven, they have integrated the consonants s-z, r, inaudible th, ch, wh, and the sleek g like in George. They can easily manage similarities like: man-woman, girl-boy, swims-flies, ling-short, sharp-blunt, sour-sweet. They comprehend the sense of, alike, end and different. They can state time to quarter hour and can write or print numerous words and perform basic reading (Murata, 2000, p.536). At eight years, a kid easily relays past events using compound and complex sentences. Few breaks in grammatical constructions occur and all sounds of speech, including consonant mixes, are developed. Reading is easy and writes basic compositions. Where appropriate, social amenities are present in the kids speech with properly developed volume, rate and pitch control. Conversations are almost at adult level and they can adhere to complex commands with minimal repetition. Time and number notions are well established. Speech is the audible expression of language and is developed in the brain. The brain organizes muscles and body organs coordination in the production of unambiguous properly-developed speech. The brain controls the movements of the oral cavity constituents including tongue, lips and jaw as well as movements of the larynx constituents. These physical structures make up speech hardware whereas their activities compose speech software. The respiratory structure, comprising of trachea (windpipe), lungs and rib cage, supplies air making the vocal cords vibrate resulting in the production of sound. The auditory system, composed of outer ear, auditory nerve, inner ear, auditory canal, and brain auditory receptors, facilitates monitoring of speech and comprehension of the speech of others (Murata, 2000, p.541). Reference Murata, N (2000). Speech-Language Strategies for Physical Educators. JOPERD-The Journal of Physical Education, Recreation 520-544 Ritzman, M. 263-282