Re: What kind of energy denotes E in Einstein's 1905 Sep 27paper?
- From: "Pmb" <someone@xxxxxxxxxxxxx>
- Date: Fri, 28 Sep 2007 21:40:11 -0400
<valls@xxxxxxxxxxx> wrote in message
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On 28 sep, 19:59, "Pmb" <some...@xxxxxxxxxxxxx> wrote:
<va...@xxxxxxxxxxx> wrote in message
news:1191027421.014702.53960@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Exactly 102 years ago (1905 September 27) Einstein wrote a very short
paper. Einstein starts referring to a body at rest with energy E. I
want to know what kind of energy is that E. Being the body at rest,
the kinetic energy is excluded. Then, what other kind of energy a body
at rest can have in 1905?
RVHG (Rafael Valls Hidalgo-Gato)
The energy that left the body was in the form of radiation. I.e. the
radiation carried away the mass.
Pete
Hello Peter. You are right, a little ahead Einstein writes about some
quantity L of light emitted from the body. But I am referring to the
energy E_0 of the body at rest before that.
The energy of a body may have different forms. E.g. it might consist a box
with three compartments in it. One of the compartments, the middle one,
consists of two charged particles being held together by a spring which is
latched in the closed position. In the body the other two compartments there
are ideal gases which have only kinetic energy. The container and partitions
are made up of atoms which have rest mass and are held together by bonds
whose associated energy also has mass. So for this body there are several
kinds of energies: Potential, EM, Kinetic, Atomic bonds, rest mass of atoms.
Suppose the latch broke. The charges would accelerate apart and would create
EM raddiation by the accelerating charges. Due to a loss of EM energy out of
the box(which is a closed system) there will be a total decrease in the mass
of the box.
Or you thing that when a
body emits light the energy must be necessary also in light form
before the emission?
No. A body could do work on its environment. I could transfere thermal
energy through heat conduction to another body and thus the mass associated
with the heat energy (i.e. the kinetic energy of the particles which are in
the box and which make up the box) leaves the box.
Pete
.
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