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Question
in a mass spectrograpg O+2 , C+, He+2 ,and H+ Are projected on a photographic plate with same velocity in uniform magnetic field then qhich will strick the plate fastest?

Answer
H+ will get there first, because it has the highest charge/mass ratio.   In an old-fashioned mass spectrograph (no longer really used by anyone), that would turn in the tightest circle at the same velocity...but "first" is not how they work.  Their readout is based on position and not time.

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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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