Do you have a
question related to physics? Since 1999 I have answered more than 7000
questions on line and many more by brief email. To see how I select
questions to answer, link here. If you do not submit a valid email address, I will not
answer your question. Please read the
groundrules
for the site. If the answer is to your liking, please
consider making a donation to help support this
service. You can browse older questions through the
categories
link above or use the site-wide
search to explore the full
archive.
Over the years I’ve answered thousands of physics
questions, and many of those answers are organized into
topic categories such as mechanics, relativity, electricity
and magnetism, optics, and quantum physics. The categories link at the top of every page leads to
this organized archive, making it easy to browse older
questions by subject or explore areas of particular
interest.
For
many years I taught physics at the university level and have
continued that work here by answering thousands of questions
from readers around the world. My background includes
advanced degrees in physics and decades of experience in
teaching, research, and public outreach. You can read more
about my training and career on the
The Physicist page.
Policies:
- Questions which
-
violate
groundrules, (Please stop sending me obvious textbook
problems. Likewise, this is not a tutoring site; do not ask me to
help you with your homework.
-
I consider to be "off the wall",
-
are not likely to be of general interest to
the many people I know read the answers, or
-
do not include a valid
email address,
will simply be discarded.
-
If your question is clearly astronomy or astrophysics, particularly
detailed questions about black holes, stellar evolution, dark matter or
dark energy, the big bang, etc., areas in which I am not expert, I may
not answer. If you google ask astronomer or ask astrophysicist you will get lots of
possibilities. I recommend
NASA's
Ask an Astrophysicist. Another good place is
Curious about Astronomy?
