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Recent Activity

  1. berkeman liked davenn's post in the thread I Why do galaxy and galaxy clusters look so colorful?.

    Many in that set are accurate colours ...... [ATTACH] [ATTACH] [ATTACH] many have been severely enhanced and no longer look like...

    ad6a7af4ec2b041d0b9a74f72cd33507.jpg 06be2886d972b643faa6b54ae196d273.jpg eea0b03ac7107a9b35630e9deba92a99--planes-group.jpg 2ef6f797d38c9f8e2afef17753304a60--phone-wallpapers-space-iphone-wallpaper.jpg 7ed86a288e4940a29d21981c7d664f68.jpg 74481d2c7ea93431887797e2fe7e42bb--galaxy-universe-the-universe.jpg Jun 25, 2017 at 11:05 AM
  2. JohnnyGui replied to the thread I Emission spectra of different materials.

    Yes, that makes sense to me. Two more things if you don't mind: 1. Does that mean that a detector that measures the radiated power from...

    Jun 25, 2017 at 11:01 AM
  3. Anshul23 liked Riotto's post in the thread highschool graduate dealing with a triple integral?.

    Triple (and higher) integrals will appear quite often in physics in several context. So if you enroll in physics major or engineering...

    Jun 25, 2017 at 11:01 AM
  4. Jilang replied to the thread I Question about the quantum Zeno effect again.

    I agree with #21. The Geiger counter is not sufficiently local to the atom.

    Jun 25, 2017 at 10:59 AM
  5. sophiecentaur replied to the thread The Peculiar Behavior of a large electromagnetic coil.

    It would be interesting to know what the purpose of the coil + core might be. A core can be there for linking flux to another inductor...

    Jun 25, 2017 at 10:56 AM
  6. Gary Smith replied to the thread B What is the smallest particle which can be visually observed.

    Found some images of atoms, but don't know what I am seeing. Would upload if it were possible. One is a blurred shadow. I would not call...

    Jun 25, 2017 at 10:56 AM
  7. NascentOxygen liked George Jones's post in the thread What are some sad songs?.

    Best wishes. [MEDIA]

    Jun 25, 2017 at 10:53 AM
  8. Averagesupernova liked berkeman's post in the thread DIY solar power system.

    The schematic really is needed before we go much further. What you have posted above makes no sense (unless I missed a place where you...

    Jun 25, 2017 at 10:53 AM
  9. berkeman replied to the thread DIY solar power system.

    The schematic really is needed before we go much further. What you have posted above makes no sense (unless I missed a place where you...

    Jun 25, 2017 at 10:50 AM
  10. berkeman replied to the thread Automotive Engineering advice.

    Welcome to the PF, Logan. :smile: Tagging @Ranger Mike in case he can offer any advice.

    Jun 25, 2017 at 10:48 AM
  11. Brandon91man replied to the thread DIY solar power system.

    I don't quite understand, it seems as though the (17V 2.2A) panel is unaffected and the (4.8V 4A) panel is just contributing amperage....

    Jun 25, 2017 at 10:48 AM
  12. Silviu posted a new thread.

    I Difference between field and wave equation

    Hello! I am reading some introductory stuff on Klein-Gordon equation and I see that the author mentions sometimes that in a certain...

    Forum: High Energy, Nuclear, Particle Physics

    Jun 25, 2017 at 10:46 AM
  13. Nugatory replied to the thread B What is the smallest particle which can be visually observed.

    It depends on what you mean by "visually observed". Without qualification, most people will understand the term to mean optical...

    Jun 25, 2017 at 10:45 AM
  14. berkeman replied to the thread Coilgun inefficient.

    @SirLollington -- You are working with fairly high energies there, and I'm not sure that the OP @oum has the background and experience...

    Jun 25, 2017 at 10:36 AM
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