# Search results

1. ### B Is there a way to measure gravity in a particular area of space

Dumb question probably -- But is there a way to measure gravity in a particular area of space, or a "measurement" .. I.E. the gravity 10 miles above earth v.s 1000 miles above. Not force on another object, but some "unit" or measure of gravity itself.
2. ### A few questions on time

Hello, If a human could travel at .9999c would their perception of time (in their own frame) be the same as the perception of time of a stationary observer (in their frame)?
3. ### Gibbs energy of formation and electrolysis efficiency

Hello - I'm having some problems understanding Gibbs energy of formation, and how it's applied to electrolysis. So, I'm hoping someone can explain what I'm doing wrong.. According to his site: http://hyperphysics.phy-astr.gsu.edu/Hbase/thermo/electrol.html (image) The change in the Gibbs...
4. ### Vibrating molecules?

I've heard molecules are constantly moving or vibrating. What is the mechanism behind this? Where does the energy come from, and go? Is it always a function of temperature/pressure?
5. ### Can photons create their own gravity?

Question.. I understand photons will curve around planets in space due to their gravity (or curved space-time). But do photons create their own gravity relative to their energy? From what I can gather, gravity is more of an aspect of energy than mass.
6. ### Measuring the magnetic and electric constants

Has the permeability and permittivity of vacuum ever been measured in a vacuum or space?
7. ### Forces unified at the time of the big bang

I noticed the following relationships, and I'm curious if these are why physicists believed all forces might have been equal (or unified) during the big bang. Pm = Plank Mass Pl = Planck Length Pt = Planck Time Pf = Planck frequency (non-angular) = 2.952104e42 Hz Eo = Electric Constant Uo =...
8. ### Question about planck charge

Has an entity in the universe ever existed with a charge magnitude of 1.87755e-18 C (planck charge)? When/where could it arise?
9. ### Charge decay

Has charge (magnitude)  lost some of its value since the time of the big bang? If so, what's the theory behind this?
10. ### How to calculate thermionic work function

How do you calculate the thermionic work function of an element (hydrogen for example)? I understand it is usually about 1/2 the ionization energy , but is there a formula to get the exact energy? Can hydrogen even have a work function? Thanks in advance.
11. ### Wave functions and magnetic fields

Can anyone explain why these two field patterns are so similar? The (3,2,1) hydrogen wave function, and this pattern generated from a magnet on a CRT. (attached to post)
12. ### Electron smear

Is there a physical meaning to the electron "smear" or probability cloud? If an object (electron) was to somehow travel faster than time, wouldn't it appear in multiple locations at once or as a "smear"?
13. ### Magnetic flux quanta in ground state hydrogen

How many magnetic flux quanta exist within the ground state hydrogen atom? Thanks in advance.
14. ### Is a photon's wavelength relative to the velocity of its source?

Is a photon's wavelength dependent on the velocity (or acceleration) of the atom which it was emitted? For example, if a photon is emitted from a stationary (or slow moving) molecule, then that molecule is accelerated. Will the photon's wavelength shift wrt to the acceleration (or...
15. ### Photon energy and gravitation

Do higher energy photons have the same trajectory around planet/gravity as low energy photons? I.e: If you were shooting photons from the same position wrt a planet would their path be the same?
16. ### Question about time and space

Could time and space just be properties of matter?
17. ### Ionization by acceleration

Is it possible to accelerate an atom (i.e. hydrogen), and have the force from acceleration overcome the binding force (between proton and electron), and ionize the hydrogen atom?
18. ### LC circuit model of hydrogen atom

I thought these were weird similarities between macroscopic electronic circuits and (Bohr) hydrogen model. What do you guys think? . hydrogen self-capacitance (energy level "capacitance") C = 4*pi*eo*br = 5.88798e-21 Farads eo = vacuum permitivity br = Bohr Radius m = electron mass e =...
19. ### Phonons _ Guage Bosons

Whats the difference between phonons and guage bosons?
20. ### Ground state energies

What regulates the ground state energy of a hydrogen atom? Why is it constant (more or less)?
21. ### Question about lorentz force

Does the lorentz force occur at the atomic level?
22. ### O2 levels in lower atmosphere

Are O2 levels dropping in our atmosphere? I read something a while ago that mentioned allergies are getting worse due to increasing CO2 levels in atmosphere, so I'm guessing O2 levels are dropping as well. I was in the mountains a week ago (out of a valley), and noticed how easier it is to...
23. ### Matter definition and Units

The definition of matter is "anything that has mass and volume". Why doesn't the definition of matter mention anything about "time". Should time be mentioned as well since matter can't exist without it? Also, If matter had its own SI unit, what would it be? Edit:: a unit that could be...
24. ### Particle charge quesiton

What physical property of a particle determines its charge polarity. For example, with an electron and positron, what makes an electrons (-) and what makes a positron (+). Is there an observable difference that explains this (other than they attract each other and annihilate)?
25. ### Atom self capacitance

can electron energy levels just be considered the self capacitance of an atom?
26. ### Question about change in entropy of a compound

Hello, I was just looking at this site: http://hyperphysics.phy-astr.gsu.edu/HBASE/thermo/electrol.html which has a value TΔS = 48.7 kJ (change in entropy) ... Which i believe comes from the entropy value 69.91 J/K. Can someone explain where the value 48.7 kJ comes from? I understand it is...
27. ### News Comment by McCain on JFK

What did McCain mean by this comment? JFK "intervention .. tragedy"? http://uk.youtube.com/watch?v=DBAsHTSbkXs
28. ### Question about time and mass

Since a photon moves at c has 0 mass, and doesn't "experience" time. Would it "see" everything in 2 dimensions (a frame) .. and could you say it only exists in 2 dimensions? Could matter exist without time?
29. ### Question about heat loss from a surface

How can I calculate the heat loss from the surface area of a box into air? Also, how can I calculate the heat/energy loss from a heated gas (into ambient air)?. Thanks in advance.
30. ### Heat loss from box surface

Hello, How can I determine the heat loss (to air) from a box of a specific material, with a heat source inside of it? Also, how do you calculate the heat/energy loss of a heated gas into ambient air. Thanks