martes, 10 de febrero de 2015

Mezcla de Luces de Colores (IYL2015 -Óptica10)

Ya hemos investigado como la “luz blanca” proveniente del Sol, es en realidad una mezcla continua de longitudes de onda desde 400 nm  (violeta) hasta 700 nm (rojo), aproximadamente, lo que llamamos el espectro visible.

Lea en este blog:
Dispersión de la luz por un prisma (IYL2015- Óptica5)
.

Espectroscopio (IYL2015 –Óptica9)
.

También se ha investigado como un medio dispersor (prisma, red de difracción, gases de la atmósfera, gotas de agua), pueden separar esa mezcla, produciendo un “arcoíris”.
La medición y el análisis del espectro particular de una determinada fuente de luz, se utiliza para investigar su naturaleza física y química.


  • ¿Podemos invertir el proceso?, es decir, ¿se puede obtener luz blanca a partir de un conjunto de luces de colores?
    La respuesta es sí.

  • Se puede lograr con un conjunto mínimo de tres colores básicos, si se usan en proporciones adecuadas en cuanto a su intensidad y longitud de onda (o frecuencia).

  • El conjunto que más se usa como los tres colores básicos es el azul (450 a 500 nm), el verde (500 a 570 nm) y el rojo (610 a 700 nm), esto porque están suficientemente espaciados entre sí, y se puede lograr con ellos una luz casi blanca sobre una superficie, si se ilumina con proporciones iguales de cada color.

  • ¿Cómo se producen fuentes artificiales de luces de esos tres colores?

    Se pueden usar bombillos incandescentes y tubos fluorescentes, que producen una luz aceptada como blanca y pasándola por un “filtro de color” que estaría en el vidrio. Este filtro transmite preferentemente el color elegido y absorbe en buena cantidad los otros colores (llamados complementarios).
    En el comercio se consiguen filtros de color de muy buena calidad, pero usted puede hacer unos usando papel celofán para cubrir la lámpara de una linterna portátil, por ejemplo (¡cuidado con el calentamiento!).
    En ferreterías se consigan fluorescentes compactos de los tres colores.

    Para motivar a sus estudiantes, el docente puede construir un el equipo básico: los tres plafones atornillados a una tabla (plywood) con la conexión eléctrica (¡en paralelo!).  Además un texto básico y varias preguntas, para compartir con la clase.

    Objetivo: Construir un soporte para colocar tres fuentes luminosas de color, iluminar una pantalla (preferiblemente blanca) e investigar el comportamiento de luz y sombras y la adición de colores.

    Materiales: Tres plafones pequeños (
    ¢700 c/u) y tornillos, regla de madera, un trozo de cable eléctrico, tres bombillos, fluorescentes compactos (¢5000 c/u), o “led” (rojo, verde, azul), enchufe, herramientas caseras, pantalla o pared blanca. Opcional: regleta, extensión eléctrica, pantallas (cartones) pintadas de diferentes colores.
    ¿Qué hacer?:

  1. Arme apropiadamente la parte mecánica y eléctrica (!plafones -en paralelo-, cuidado!). Coloque los bombillos a unos 50 cm de una pantalla blanca.

    !Esta observación requiere hacerse en un aula que se pueda obscurecer, o realizarla durante la noche!
    Disfrute e investigue.
    Mantenga las variables controladas, para analizar sus efectos.
     

  2. Coloque un obstáculo (!su mano!) que produzca sombra sobre la pantalla. ¿Qué sucede?

  3. Tape, o desconecte uno, o dos bombillos. ¿Cómo cambian las sombras y el fondo (pantalla)?

  4. Cambie a una pantalla de color (siempre blancusco) y repita.

  5. Si puede independice los bombillos (orden, distancia, intensidad de la corriente eléctrica) – tenga cuidado-.
    Investigue.

Referencias adicionales:

http://en.wikipedia.org/wiki/Additive_color .

http://en.wikipedia.org/wiki/RGB_color_model .
http://www.webexhibits.org/causesofcolor/1BE.html
.
http://www.physicsclassroom.com/class/light/Lesson-2/Color-Addition
.

22 comentarios:

  1. Hey, Your blog is very informative. It is nice to read such high-quality content. Attractive information on your blog, thank you for taking the time and share with us.The experts of our student essay writing services in UK provide custom dissertation for you within the time that you provide us Myassignmenthelp delivers high-quality content related to how to write a law essay.

    ResponderBorrar
  2. Law assignment help is a very important a part of our entire service portfolio in helping students in Australia. Law is a very important subject for students as a result of legal rules and laws are applicable to every and each country. Having associate degree in-depth understanding of law subject is therefore essential to students that square measure finding out in Australia. we have Academic expert of law assignment writers that Providing High- quality assignment. if you need contact our expert team

    ResponderBorrar
  3. Very Nice Blog! This Blog is Totally Informative About Assignment help in Australia. If You Are Looking For The Assignment help Sydney Provider Then You Should Definitely Go For myassignmenthelpau.com

    ResponderBorrar
  4. Nice to be visiting your blog again, it has been months for me. Well this article that i've been waited for so long. I need this article to complete my assignment in the college, and it has same topic with your article. Thanks, great share.
    coca cola financial analysis

    ResponderBorrar
  5. Take Assignment Help if you have any issue for composing your academic papers. If you connect with trustworthy service provider, browse various web pages of greatassignmenthelp for more information.
    Assignment Help Online
    Online Assignment Help
    Assignment Help Online Services
    Assignment Helper
    Assignment Assistance
    Assignment Help Experts
    Online Assignment Help Services

    ResponderBorrar
  6. Hi, this is a wonderful piece of writing. I want to say that a nursing professional portfolio is a must-have document for every nurse. It contains everything a nurse needs in their career. The idea is to collect everything and have it in one place to easily trace them whenever you need them. There are nursing students who finding compiling the documents and putting them in one place difficult and opt to look for help in a platform like Nursing Professional Portfolio . Luckily, we are always here to help.

    ResponderBorrar
  7. I simply couldn't resist praising the way you play with words. This is a perfect example of a well-written blog post. If you are looking for a dedicated team of editing and proofreading experts to polish your academic write up, the Livewebtutors platform can be the one-stop solution for you. The portal has comprehensive Assignment Help London services ranging right from the writing of short essays to tackling be complicated dissertation writing process. If you are want to see a remarkable transformation in your academic grades, this is the platform for you.

    ResponderBorrar
  8. Kudos. I appreciate the effort you make to give out article like this. Winning the BSG is not that easy. You need to be aware of some of the effective business strategy game simulation tips through which you can stay ahead of the competition. Here, business is not only about selling, but there’s also much more you need to be aware of. Go ahead and reach out to us for Bsg Game Help

    ResponderBorrar
  9. I couldn’t ignore the art of writing you have to ensure you deliver the best. If you are a student working on a paper that requires data analysis such as a statistical research project or a dissertation on the location of features and boundaries around the earth, the major challenge you are likely to face is getting a better understanding of the data and materials that you’ve gathered. Go ahead and reach out to us for Data Analysis Help

    ResponderBorrar
  10. I love the way you put your points. Thank you. Did you know that the first law of thermodynamics is that energy cannot be created or destroyed?. While this law is always true, energy can be transformed from one type to another. Heat can be changed into kinetic (moving) or latent/potential (stored) energy. Thermodynamics uses P-V-T (pressure, volume, and temperature) diagrams to model these transformations. Get Thermodynamics Help

    ResponderBorrar
  11. I love the way you put your points. Thank you. Did you know that the first law of thermodynamics is that energy cannot be created or destroyed? While this law is always true, energy can be transformed from one type to another. Heat can be changed into kinetic (moving) or latent/potential (stored) energy. Thermodynamics uses P-V-T (pressure, volume, and temperature) diagrams to model these transformations. Get Thermodynamics Tutor

    ResponderBorrar
  12. You have a great article. Product reviews are an essential part of an online store's branding and marketing. They help build trust and loyalty, and typically describe what sets your products apart from others. Bicity Reviews brings you the top best and unbiased Product Reviews

    ResponderBorrar
  13. Thank you for your outstanding article. You will always find clients coming back to us which is a result of our excellent services. Our goal is to offer unique and specialized services to our clients and in return create a long-lasting working relationship. We provide the Best ace divino noida extension and 3 BHK, 4 BHK Flats, Apartments, Penthouse, Corporate Properties, Commercial Properties in Noida, Greater Noida West, Delhi NCR with Great Discount and Deals. Learn more about Investmango visit our website and call now:- 8076042671

    ResponderBorrar
  14. My Name is Abhay Kumar. I’m a Blogger living in India. I am a fan of technology, design, and writing. I’m also interested in programming and blog. I would like to share articles related to SEO, blogging tutorials, WordPress Tutorial, Make money online. You can read my blog.
    ethical hacking training in gurgaon

    ResponderBorrar
  15. Acquisition of Haemophilus occurs as a result of inhalation of aerosolized respiratory droplets. essay help

    ResponderBorrar
  16. The main reason which makes it easy for children to get infected by the bacteria is that they acquire a state of nasopharyngeal colonisation which is a common feature in children at early life. essay help

    ResponderBorrar
  17. This is a wonderful piece of content. Thanks for sharing. Need help with Capstone project Writing? There are so many online professional writing services that can lighten your burden. My Assignment Help Desk is one the most competent and trustworthy capstone writing agencies you can ever find. Read more on Capstone Project Help .

    ResponderBorrar
  18. There is a great passion behind your writing. I really love it. That is why we offer high-quality DNP capstone assistance to our clients. If you need any help in capstone writing, it is necessary to consult a legit custom writing firm. By contacting us, you can be certain of getting high-quality DNP Capstone Project Writing Help and plagiarism free work. Read more on DNP Capstone Project Writing Help .

    ResponderBorrar
  19. My Assignment Help provides academic myassignmenthelp to students so that they can feel relax and focus on another important thing in their life. We have many professional experience content writers to provide you best for your work.

    ResponderBorrar
  20. If you are looking for the assignment help check all the details of the assignment help for me here.

    ResponderBorrar
  21. Thank you for this amazing article. Undoubtedly nursing is among the most marketable courses in the world and it’s the dream of every nursing student to grab a slot in such courses because they are almost guaranteed of getting a job upon completing the course making the application process competitive the same as getting nursing school admission. Read more on Nursing Admission Essay Help

    ResponderBorrar
  22. Thank you for this amazing article. As a nurse, managing multiple work streams is a must. They may include administrative tasks and patient care. Medical practitioners with comprehensive personal statements have the quickest turnaround time for their summited nursing personal statement applications. Read more on Nursing Personal Statement Help

    ResponderBorrar