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Reflection and Absorbtion of Microwaves, also Masers

  1. May 24, 2009 #1
    I have tried searching for answers to these questions but i cant seem to find them, so if anyone could help me it would be greatly appreciated.

    How efficiently you can reflect microwaves? I know visible light can be reflected at 99.99% efficiency or something ridiculous like that, is it the same for microwaves?
    Also, how much are microwaves absorbed as they pass through the atmosphere? I havent been able to find any exact figures.
    Finally, does anyone know what is the most powerful continuous-wave maser that's been made?
  2. jcsd
  3. May 24, 2009 #2


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    They can be reflected extremely efficiently; I don't think there is any practical difference between microwaves and light in this respect.

    The absorption will depend on the frequency of the microwaves (remember that "microwaves" refer to frequencies from a few hundred MHz up to about 1 THz or so) but also on the atmosphere; the amount of waver vapour (i.e the humidity) can make a huge difference, especially when dealing with higher frequencies.
  4. May 25, 2009 #3
    Ive been trying to find some figures for it at certain humidities or certain wavelengths, but i cant really find anything.:frown: I know the "radio window" goes from about 1cm to 11m wavelengths, where microwaves are absorbed very little, but it would be very useful to have some figures to work with.
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