quarta-feira, outubro 04, 2006

Espectro electromagnetico: Cores

É tentador pensar que a Radiação gama (pensem Chernobill) é completamente diferente da luz ou do rádio, mas a verdade é que a única coisa que varia é o comprimento de onda, ou seja, a distancia entre dois picos de uma dada onda:

Comprimento de onda: a distancia
entre dois picos de uma onda.

Há comprimentos de onda para todos os gostos: algumas ondas rádio têm centenas de metros entre os seus picos e outras são mais pequenas que moléculas:

Da esquerda para a direita:
Radiação gama, Raio X, Ultravioleta, Luz, Infravermelhos e Rádio


Como se pode ver pelo grafico acima, aquilo a que chamamos "luz" não é mais que uma muito pequena parte de todas as radiações que existem - 0 espectro electromagnético.
Dentro deste pequeno intervalo que é a luz visivel, o nosso cerebro consegue ainda distinguir 10 milhões de sub-intervalos, às quais chamamos cores.
O arco-irís, por exemplo, é a decomposição selectiva da luz nas suas cores constituintes. Sabe-se que na realidade o arco-iris tem 9 cores, porque há duas que não se vêm - o infravermelho e o ultravioleta. Porquê? Porque é que não vemos mais do que aquela estreita banda de cores?

(continua)

12 Comments:

Anonymous Anónimo said...

Olha que eu nem 7 cores do arco iris vejo.....

11:39 da tarde  
Blogger Pyny said...

Não são sequer 7 cores. A divisão das cores é apenas criação do homem. Não serã que a radição gama tem uma frequência maior, e logo maior energia, de acordo com a Teorica de Planck?

1:04 da tarde  
Blogger Pyny said...

A radiação gama, e também alguma radiação UV, provoca cancro uma vez que nas moléculas de DNA quebra as ligações fosfodiéster entre a desoxirribose e a base azotada formando tetrâmetros, geralmente de timina. Existem, in vivo, alguns mecanismos enzimáticos de defesa, mas não se pode ter tudo, não é? :P

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Hi - I am certainly glad to discover this. great job!

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