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Question
Sir can u plzź tell me that how are radio transmission goes to hilly areas...plzz tell me about this..

Answer
It doesn't go through hilly areas well, but some radio wave reflection and diffraction effects in hills.  The longer the wavelength, the more it can diffract.  However, most of the reason that broadcast towers are built on high ground and are so tall is for transmission efficiency.  You can read up on diffraction and radio transmission here:
http://www.acoustics.salford.ac.uk/feschools/waves/diffract2.php

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Dr. Stephen O. Nelson

Expertise

I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.

Experience

I was a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. My travelling science show saw over 20,000 students of all ages. I taught physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science. I moved on to a non-academic job with more research just recently.

Education/Credentials
Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.

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