Doppler Effect
Theoretical information about the history of the discovery of the Doppler effect, the disclosure of its physical nature. Building plot of the Doppler frequency of target velocity at a certain speed range and for given parameters of the wavelength.
| Рубрика | Физика и энергетика |
| Вид | лабораторная работа |
| Язык | английский |
| Дата добавления | 26.06.2011 |
| Размер файла | 124,8 K |
Отправить свою хорошую работу в базу знаний просто. Используйте форму, расположенную ниже
Студенты, аспиранты, молодые ученые, использующие базу знаний в своей учебе и работе, будут вам очень благодарны.
Размещено на http://www.allbest.ru/
Ministry of Education And Science of Ukraine
National Aviation University
Laboratory work
On the theme: "Doppler Effect"
Executed by: Samokhina
Margaret (IASU_513)
Checked by: Glushko D.N.
Kyiv 2010
Theoretical information
The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the change in frequency of a wave for an observer moving relative to the source of the wave. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession.
The relative increase in frequency can be explained as follows. When the source of the waves is moving toward the observer, each successive wave crest is emitted from a position closer to the observer than the previous wave. Therefore each wave takes slightly less time to reach the observer than the previous wave. Therefore the time between the arrival of successive wave crests is reduced, causing an increase in the frequency. While they are travelling, the distance between successive wavefronts is reduced; so the waves "bunch together". Conversely, if the source of waves is moving away from the observer, each wave is emitted from a position farther from the observer than the previous wave, so the arrival time between successive waves is increased, reducing the frequency. The distance between successive wavefronts is increased, so the waves "spread out".
For waves that propagate in a medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from motion of the source, motion of the observer, or motion of the medium. Each of these effects is analyzed separately. For waves which do not require a medium, such as light or gravity in general relativity, only the relative difference in velocity between the observer and the source needs to be considered.
Task: To calculate and plot the graph of the dependence of Doppler frequency from the velocity of the target at the wavelength л=0.03 sm, velocity range V=0-300 km/h.
effect doppler frequency wave
|
Fd=2V/л Fd1=370,37 V1=20 m/s Fd2=740,74 V2=40 m/s Fd3=1111,111 V3=60 m/s Fd4=1481,48 V4=80 m/s Fd5=1851,85 V5=100 m/s Fd6=2222,222 V6=120 m/s Fd7=2592,53 V7=140 m/s Fd8=2962,96 V8=160 m/s Fd9=3333,333 V9=180 m/s Fd10=3703,7 V10=200 m/s Fd11=4074,074 V11=220 m/s Fd12=4444,444 V12=240 m/s Fd13=4814,81 V13=260 m/s Fd14=5184,18 V14=280 m/s Fd15=5555,555 V15=300 m/s |
Conclusion: At this laboratory work we've investigated the dependence of Doppler frequency from the velocity of the target. So, as we see from the graph, it is linear dependence.
Размещено на Allbest.ru
Подобные документы
The photoelectric effect. The maximum kinetic energy. Putting it all together. Can we use this idea in a circuit. The results of the photoelectric effect allowed us to look at light completely different. The electron microscope. Wave-particle duality.
презентация [2,3 M], добавлен 06.04.2016The overall architecture of radio frequency identification systems. The working principle of RFID: the reader sends out radio waves of specific frequency energy to the electronic tags, tag receives the radio waves. Benefits of contactless identification.
курсовая работа [179,1 K], добавлен 05.10.2014The principles of nonlinear multi-mode coupling. Consider a natural quasi-linear mechanical system with distributed parameters. Parametric approach, the theory of normal forms, according to a method of normal forms. Resonance in multi-frequency systems.
реферат [234,3 K], добавлен 14.02.2010Reducing the noise and vibrations by using hydraulic absorbers as dampers to dissipate the energy of oscillations in railway electric equipments. The phenomenon of the phase synchronization. Examples of stable and unstable regimes of synchronization.
статья [153,4 K], добавлен 25.03.2011The basic principles and the protection of power lines patterns used in this process methods. Physical basics of high-power transformers in substations. Justification of the information received. Diagram illustrating the operation of the protection.
презентация [628,0 K], добавлен 18.02.2016Determination of wave-length laser during the leadthrough of experiment in laboratory terms by means of diagnostics of laser ray through the unique diffraction of cut. Analysis of results: length of fringe, areas and interrelation between factors.
лабораторная работа [228,4 K], добавлен 29.12.2010Study of synthetic properties of magnetic nanoparticles. Investigation of X-ray diffraction and transmission electron microscopy of geometrical parameters and super conducting quantum interference device magnetometry of magnetic characterization.
реферат [857,0 K], добавлен 25.06.2010Completing of the equivalent circuit. The permeance of the air-gaps determination. Determination of the steel magnetic potential drops, initial estimate magnetic flux through the air-gap. Results of the computation of electromagnet subcircuit parameters.
курсовая работа [467,8 K], добавлен 04.09.2012The properties of the proton clusters in inelastic interactions SS. Relativistic nuclear interaction. Studying the properties of baryon clusters in a wide range of energies. Seeing the high kinetic energy of the protons in the rest of the cluster.
курсовая работа [108,6 K], добавлен 22.06.2015Ability of the company to reveal and consider further action of competitive forces and their dynamics. Analysis of environment and the target market. Functional divisions and different levels in which еhe external information gets into the organization.
статья [10,7 K], добавлен 23.09.2011
