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  1. ..., but there are telescopes for most of the spectrum of electromagnetic radiation and for other signal types. An optical telescope gathers and focuses...

  2. ... to astronauts. Among EM radiation , gamma rays presents more problems... from various sources (stars and other heavenly bodies). Cosmic rays ...

  3. ...發射同吸收幅射速率較高. There are other factors,including Temperature...object is higher than outside,it will emit radiation and become cool. The temperature of object is ...

  4. ... other ? Sound cannot travel through the vacuum of space, but visible light and other forms of electromagnetic radiation can. One of these forms is commonly called radio. ...

    分類:社會及文化 > 語言 2008年06月19日

  5. ... radiation like radio waves, microwave, UV, X-ray and gamma rays, and the other is particle radiation , like alpha, beta particles, neutrons, muons, pions...

  6. ...the energy balance of the planet by absorbing longwave radiation emitted from the Earth's surface. ...or scattered back to space by clouds and other atmospheric particles. About 19 % of the...

  7. ... the link between radiation exposure and death from leukemia, lung, liver, skeletal and other solid cancers. Alongside radiation , gamma-rays also produce thermal burn injuries and induce an immunosuppressive...

  8. ...nucleic acid can remain stable at 400+ deg C), and Mars has too thin an atmosphere to protect these molecules from radiation damage - we don't even have to consider other planets because their physical...

    分類:科學及數學 > 生物學 2008年03月13日

  9. ...large mass, +2 charge and relatively low velocity, they are very likely to interact with other atoms and lose their energy, so they are effectively absorbed within a few...

  10. ...which is a good absorber of thermal radiation is also a good emitter of thermal radiation , and vice versa. Dull surface objects absorb more thermal radiation than shiny...