1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Less harmful electromagnetic waves

  1. Jun 21, 2011 #1
    Hi guys,
    I am too old to remember basic knowledge about electromagnetic waves :D
    I am looking for a combination of an electromagnetic wave and a material such that the wave can pass through human tissues, but it is blocked by the material. All I know is that X-ray/gamma can penetrate human body but is absorbed by metals/lead. Are there any such other combination which are less harmful than X-ray. I have gone through Wikipedia for few hours but still have not found the answer yet.
    Could you please help me.
    Thank a lots.
  2. jcsd
  3. Jun 21, 2011 #2


    User Avatar
    Science Advisor

    Radio waves pass easily through the human body, but are blocked by an appropriate thickness of metal (or any conductor).
  4. Jun 21, 2011 #3
    Thank you for the answer!
    But I think radio waves are able to diffract around the object, is that right?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook