Energy: Real Thing - Different Forms & Mass as Dense Concentration

[anantchowdhary]

Energy the Real Thing(II)

we say that mass is another form of energy.But then what makes mass different?

 

[cesiumfrog]

mass isn't another form of energy, rather, energy has (relativistic) mass in every form.

 

[anantchowdhary]

mass is a form of energy.Why can't we say that?

 

[disregardthat]

Well the E=mc^2 says energy EQUALS mass. I see your point.

Can we measured how much energy one photon carries in Joules?

 

[ranger]

Well the E=mc^2 says energy EQUALS mass. I see your point.

Can we measured how much energy one photon carries in Joules?

The energy can be found by:
E = hf
Where h is Planck's constant and f is the frequency.

If the units of Planck's constant is Joules second and the unit of frequency is 1/second:

J = J*s \frac{1}{s}
The seconds cancel out and we have the unit of joule.

 

[Zeit]

Hello,

Well the E=mc^2 says energy EQUALS mass. I see your point.

In fact, energy doesn't equal mass, but according to this well known formula, E=mc² indicates that whatever are the speed or the motion of a body, if it has a mass, it has energy.

E=mc² comes from a bigger formula which is E^2 = p^{2}c^{2}+m^{2}c^{4}. Using that equation, you can calculate the energy of anything moving at a constant speed in a "straight line".

EDIT : Well, ranger has been faster than me :)

 

[cristo]

mass is a form of energy.Why can't we say that?

we say that mass is another form of energy.But then what makes mass different?

anantchowdhary, I urge you to read through this thread, paying particular attention to Zapperz's posts. If you have any specific questions feel free to ask them, but you are still asking the same question you asked weeks ago; one that has been answered!

spin hmm.Please read a brief histry of time-stephen hawking and u should be able to get some idea

Pointing someone towards a popular science book and saying from that you "may get some idea" is not the way to explain a new concept to someone.

 

[cesiumfrog]

In fact, energy doesn't equal mass [..] E=mc² comes from a bigger formula which is E^2 = p^{2}c^{2}+m^{2}c^{4}.

Perhaps this is just interpretation, but I think those are different formulas.

Energy is the ratio of momentum to velocity, called relativistic mass. It is nonzero for photons and also "dilates" for matter that increases velocity.

But if you wish to only consider rest-mass (which photons in particular lack completely), then yes, you'll need that more complicated formula.

And if you completely forget about the other interpretation, it seems to you like those people printing E=mc² on t-shirts only understood half the story. Personally, I think they're following the ones who've applied Occam's razor correctly.

 

[Ballon]

Is Mass energy bending (or curving) the SpaceTime or the effect of the opposite ? Is Mass (energy) the result of the Spacetime pressure trying to restore its fabric (assuming that the normal geodesic is "no curvature") but finding this "matters" (Object) to deal with ?

 

[daniel_i_l]

What is spin?

The spin of a particle basically defines how many states of momentum the particle can have. For example, an electron with spin 1/2 can have two states of momentum: 1/2, -1/2. a particle with spin one can have 5: 1, 1/2, 0, -1/2, -1.