Analysis of the Doppler Effect

Analysis of the Doppler Effect Assignment 3: topics and themes in physics- oscillations and waves Doppler radar A Doppler radar is specialized radar that uses the Doppler Effect to produce data about an objects velocity at a given distance. Doppler radar works by bouncing microwave signals at the desired target and then listening to its reflection, then the returning frequency is analysed to see how it has changed from the original signal. This variation gives direct and highly accurate measurements of the radial component of a targets velocity relative to the radar. The Doppler effect (or Doppler shift), named after the famed Austrian physicist Christian Doppler who proposed it in 1842 and is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves. It is commonly heard when a vehicle sounding a siren approaches, passes and dulls from an observer perspective. When a wave with angular frequency ω and phase velocity c propagates in a medium, an observer moving with velocity v parallel to c experiences a shifted frequency ω1 = ω (1 − v/c) (1). They do not depend on the relative velocity as other circumstances do occur. Electromagnetic waves share with sound the same property which is propagation velocity. It is independent of the motion of the source . Einstein formulated his extended principle of relativity stated that all physical and electromagnetic forces should depend on relative velocities. From this he created Lorentz transformation. Sound vs. Light There are three differences between acoustical (sound) and optical (light) Doppler effects: The optical frequency change is not dependent on which is moving the source or observer either is it affected by the medium through which the waves are moving, but acoustical frequency is affected by these things. Optical frequency changes are affected if the source or observer moves at right angles to the line connecting the source and observer. Observed acoustical changes are not affected in such a situation. Applications of the Doppler phenomenon include the Doppler radar and the measurement by astronomers of the motion and direction of celestial bodies. Light itself travels at 186,000miles a second (, but unlike sound light doesn’t need to travel through a medium. Whereas sound cannot be transmitted into space light can be in the form of radiation and also a form of energy that is put through a vacuum. The Doppler effect of light is more commonly known as the relativistic Doppler Effect. The Doppler Effect In Astronomy In astronomy, the Doppler Effect was originally studied in the visible part of the electromagnetic spectrum. Today we can the see the use of the Doppler shift(Doppler effect) applies to all parts of the electromagnetic spectrum. Also, because of the inverse relationship between frequency and wavelength, we can describe the Doppler shift in terms of wavelength. Radiation is red shifted when its wavelength increases, and is blue shifted when its wavelength decreases. Astronomers use Doppler shifts to calculate very accurately at what rate stars and other astronomical objects are moving towards or away from Earth. For example the spectral lines emitted by hydrogen gas in distant galaxies is often observed to be considerably red shifted. The spectral line emission, normally found at a wavelength of 21 centimetres on Earth, might be observed at 21.1 centimetres instead. This 0.1 centimetre redshift would indicate that the gas is moving away from Earth at over 1,400 kilometres per second (over 880 miles per second). The red shift As an object moves further away from an observer the light waves emitted are affected by the Doppler Effect. In 1923, American astronomer and physicist Edwin Hubble (1889-1953) observed that the light waves from distant galaxies were shifted so much to the red end of the light spectrum that they must be moving away from the Milky Way, the galaxy in which Earth is located, at a high rate.(10) After these finding he then furthered his studies and came up with a mathematical formula in which he could determine how far away and at what rate they were moving away from the galaxy and how far towards the red shift. This formula is known as Hubble’s constant. From this a lot of other astronomers have come together and came up with the theory that the universe emerged instantly in a sort of bang, therefore coming amount the big bang theory. My research of galaxies the sun itself contains helium. This is proven as on the spectrum scale there are black lines in which the sun has absorbed light through the helium The Doppler Effect in aerospace Sonic booms, usually produced by airplanes passing through the sound barrier, are another example of the Doppler Effect. As a plane approaches the sound barrier the sound waves become increasingly compressed at the front of the plane. Pilots have also reported that they feel noticeable wall or barrier as they approach the speed of sound, and this is due to this intense compression of the sound waves. When the plane reaches the speed of sound, and passes through, it is said to go supersonic. There have been high speed photos taken of high velocity objects such as planes and bullets approaching, then breaking through the sound barrier. In these, the compression of the sound waves are clearly shown in the front, with the concomitant lengthening at the rear, just as would be expected by the Doppler Effect. Doppler Navigation System uses the Doppler effect to measure an aircrafts ground speed and heading. The Doppler radar functions by continuous measurement of Doppler shift and converting the measured values to groundspeed and drift angle. In early systems the aircrafts departure point was loaded into a navigation computer, which then converted the aircrafts heading and Doppler ground speed/drift inputs into a continuous display of aircraft position; this was then displayed as latitude and longitude, and/ or as distance to go along track and position left or right of track, in nautical miles. Aircraft navigation systems such as these are very important because they are key in getting the aircraft from one location to another safely. Doppler navigation is also one of the systems that air traffic controllers use, its allows then to see an aircraft’s exact heading, air speed and altitude. This allows the aircraft controller to give keep aircraft in clear and uncongested air which s ignificantly reduces the chances of in air collisions. DOPPLER RADAR The police also utilise the Doppler Effect in the form of Doppler radar to calculate the speed of passing car and to check whether they are obeying the speed limits. This technology is not only used by the police but also by meteorologists. The change in frequency experienced as a result of the Doppler effect is exactly twice the ratio between the velocity of the target (for instance, a speeding car) and the speed with which the radar pulse is directed toward the target. From this formula, it is possible to determine the velocity of the target when the frequency change and speed of radar propagation are known. The police officers Doppler radar performs these calculations; then all the officer has to do is pull over the speeder and write a ticket. The development in Doppler radar has also helped to helped to eliminate aviation crashes associated with microburst. A microburst is a very localized column of sinking air caused by a small and intense downdraft within a thunderstorm. The crash Delta Air Lines Flight 191 , which a microburst was the primary cause for the crash of the Lockheed L1011 Tri-Star was key factor in the push for developing microburst detection system. As a result of the crash, planes are now fitted with Doppler radar as standard. It allows pilots to prepare for microburst and allows then to increase power to the engines to stop the plane from crashing. The Doppler radar system of the plane is usually located in the planes ray dome. Meteorology Meteorologists use Doppler radar to track the movement of storm by detecting the direction and velocity of raindrops or hail, for instance, Doppler radar can be used to determine the motion of winds and, thus, to predict weather patterns that will follow in the next minutes or hours. But Doppler radar can do more than simply detect a storm in progress: Doppler technology also aids meteorologists by interpreting wind direction, as an indicator of incoming storms. Meteorologists use a similar principle to read weather events. In this case, the stationary transmitter is located in a weather station and the moving object being studied is a storm system. This is what happens: Radio waves are emitted from a weather station at very specific frequency. The waves are large enough to interact with clouds and other atmospheric objects. The waves strike objects and bounce back toward the station. If the clouds or precipitation are moving away from the station, the frequency of the waves reflected back decreases. If the clouds or precipitation are moving toward the station, the frequency of the waves reflected back increases. Computers in the radar electronically convert Doppler shift data about the reflected radio waves into more useful pictures which show wind speeds and direction. Doppler radars are also a lot more sensitive to movement of targets in general, whether they are moving towards or away from the radar site which things such as birds, insects, or just clouds when they are operated in certain modes. Doppler radars measure a targets velocity, which both is the speed of movement the direction that its moving. These types of radars allow meteorologists to see a lot of the in detail movements that go on inside thunderstorms, this then allows the meteorologists to predict how those thunderstorms will behave in the future. Doppler Echocardiogram A traditional echocardiogram uses sound waves to produce fairly accurate images of the heart. In this procedure, a radiologist uses a transducer to transmit and receive ultrasound waves, which are reflected when they reach the edge of two structures with different densities. The image produced by an echocardiogram shows the edges of heart structures, but the down side it cannot measure the speed of blood flow as it makes its way through the heart. In a Doppler echocardiogram, sound waves of a certain frequency are transmitted into the heart. The sound waves bounce off blood cells moving through the heart and blood vessels. The movement of these cells, either toward or away from the transmitted waves which then results in a frequency shift that can be measured. This helps cardiologists determine the speed and direction of blood flow in the heart which is the most significant difference between the traditional echocardiogram and a Doppler echocardiogram. Transverse and longitudinal waves A transverse wave is a moving wave that consists of oscillations occurring at right angles to the direction of energy transfer. If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the y–z plane. For transverse waves in matter the displacement of the medium is at 90 degrees to the direction of propagation of the wave. A ripple in a pond and a wave on a string are easily visualized forms of transverse waves. Examples of transverse waves include S (secondary) waves, and the motion of the electric (E) and magnetic (M) fields in an electromagnetic plane wave, which both oscillate perpendicularly to each other as well as to the direction of energy transfer. Conclusion In conclusion this reports through my many hours of research, talks in detail about the history and the useful applications of it. Aircraft and aerospace engineering as they use Doppler radar is a very interesting and a wide range of applications and I have toughly enjoyed researching about it especially since these are topic areas which i am particularly interested and other practical uses with the speed guns used in the police force and also the sirens on the motor vehicles. The application of the Doppler Effect and its applications in aerospace are a very interesting subject and something which i very much look forward to looking and working on in am going into university.

Advantage of SNS

The term Social Networking Site has often been used interchangeably with the term social network site. The definition of the two terms are one the same. According Boyd and Ellison, social network sites are, â€Å"web-based services that allow individuals to (1) construct a public or semi-public profile within a bounded system, (2) articulate a list of other users with whom they share a connection, and (3) view and traverse their list of connections and those made by others within the system.The nature and nomenclature of these connections may vary from site to site.† The authors chose the term network instead of networking simply because the latter term emphasizes building new relations between people. Although SNS have allowed people to meet others, it appears that the main purpose of SNS is to communicate with people who are already part of their extended social network.Social network sites are used in different ways and for different purposes. Users of such sites take advan tage of its various features that allow them to do different things. One feature of social network sites that is considered advantageous is that it allows users to share information with each other.Also, users have the option to share only the information that they want. Each user of each site has a profile page. This page contains a personalized description of the member.Demographic details, tastes, videos and photographs are the common things found on profiles. (Boyd) From these pages, the users can share their information with others people. Also, some use SNS to share pictures and videos with their friends.SNS are also useful for they allow users to build new relationships and maintain current ones. Some use such sites to meet new people. According to Lenhart and Madden, â€Å"For girls, social networking sites are places to reinforce pre-existing friendships, while for the boys who use the sites, the networks provide opportunities for flirting and making new friends.†Soc ial network sites are commonly utilized to communicate with friends. In a study conducted on why teens use social network sites, Lenhart and Madden found that, â€Å"91% of all social networking teens say they use the sites to stay in touch with friends they see frequently, while 82% use the sites to stay in touch with friends they rarely see in person.†Whatever type of relationship it is, it is evident that social networking sites build and foster relationships particularly friendships.Another reason why social networking sites are useful and popular is that it builds and strengthens communities. Social network sites allow users to choose the people who will become part of their network. These associations form the communities.Choosing Friends in social network sites give the users a chance to write their communities into being. (Boyd). SNS creates and improves communities based on similarities between users. Some sites such as MySpace connect people based on shared interest s. (Ellison et al)Also some sites such as Facebook allow its members to, â€Å"Join virtual groups based on common interests, see what classes they have in common, and learn each others' hobbies, interests, musical tastes, and romantic relationship status through the profiles.† (Ellison et al)Social network sites are advantageous because they allow users to create their identity and space. Through the profiles, the users are able to create an image of themselves. Their profile page is their space, defined they way they want and containing the things they want.More importantly, the user’s social network is his space and he has the ability to change it simply by adding or removing people from his list. His social network defines his identity as well. According to Donath and Boyd, â€Å"Public displays of connection serve as important identity signals.†Works Citedboyd, danah, & Ellison, Nicole. â€Å"Social network sites: Definition, history, and scholarship.† Journal of Computer-Mediated Communication, 2007, 13(1), article 11.   2 December 2007 .boyd, danah. â€Å"Why Youth (Heart) Social Network Sites: The Role of Networked Publics in Teenage Social Life.† In David Buckingham (Ed.), Youth, Identity, and Digital Media (pp. 119-142). Cambridge: MIT Press. 2 December 2007 .

Supernatural Motives in Shakespeares Macbeth - 676 Words

From the beginning, the witches were Macbeths biggest problem. If Macbeth would have never met the three wyrd sisters in the woods that day, he would have never thought to kill King Duncan. From that day on the witches stayed inside Macbeths head and pretty much controlled his thoughts. Lady Macbeth didnt help much with the situation when she called to the demonds and asked them to unsex her and turn her into a non feminine murderer, to do bloody deeds to obtain the crown. When Macbeth began to have doubts about killing King Duncan, he was then shown the floating dagger. Then because Banquo was with Macbeth when they met the wyrd sisters, Macbeth had to kill him because he knew Banquo had suspicions. After he had Banquo killed he went to see the witches again. This time the head witch, Hecate found out what the three sisters were doing and decided to have them play a good trick on Macbeth this time. When Macbeth first met the witches he didnt even know what or who they were. They al l said hail Macbeth which confused him. This was part of their plan of telling Macbeth he was to get the crown. After Macbeth left and headed back, he started to think hard about how much he wanted that crown. Macbeth was suppose to be King Duncans friend, not his killer. His job was to protect the king, but his thoughts the witches put in his head about the power he could have overcame his duties. He contemplated in his head and even wrote Lady Macbeth a letter telling her about what hes beenShow MoreRelatedRole of Supernatural in Shakespeares a Midsummer Nights Dream1547 Words   |  7 PagesStudy of Shakespeares Use of the Supernatural (Penn State University, English 444.2: Spring 1998) by Fred Coppersmith Near the end of the opening scene of Macbeth, Shakespeares three Weird Sisters proclaim in unison that fair is foul, and foul is fair, providing us, as readers, with perhaps the best understanding of the plays theme and the tragic downfall of its central character. 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Framing Effects, Risky Choice And Risk - 1572 Words

Framing is one of the most notable cognitive biases. It differs individuals’ judgments toward an identical problem by presenting it in different ways. In general, we expect decisions made under framing effects are deviated from the norm and rational judgment due the adoption of mental frames, which created the illusion for individuals. Different types of framing have been identified, for example, Hallahan (1999) classified framing into seven different types, including situations, attributes, choices, actions, issues, responsibility, and news. (Levin, Schneider and Gaeth, 1998) have classified framing effects into three major types: risky choice, attribute and goal framing. Some other types of framing have been discovered after these classifications published; number of size framing and framing risk in either absolute or relative terms are the most well known. 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