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Question
huh? that answer was really helpful
http://www.allexperts.com/user.cgi?m=6&catID=1358&expID=65270&qID=4890545

Answer
Suppose a space ship is coming toward you at the speed of light and turns its headlamp on.  If you measure the speed of that beam, it will not exceed 3x10^8m/s.  The only time the speed of light changes is when the beam travels through some medium other than a vacuum, such as glass or water.  Then it's less as indicated by the index of refraction.  

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Richard J. Raridon

Expertise

I can answer most questions in undergraduate physics courses, including electricity and magnetism, atomic and nuclear, mechanics and optics.

Experience

I have taught undergraduate physics courses

Organizations
Sigma Xi, AAAS, SE section of APS

Education/Credentials
BA in math, MA in physics, PhD in physical chemistry

Awards and Honors
Fellow of AAAS

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