Science > Physics > Einstein E=mc2 . Should Newton , De Pretto , Preston, Hasenohrl and Soddi, Planck be given credit for discovery of E=mc2. ?
| Topic: |
Science > Physics |
| User: |
"AJAY SHARMA" |
| Date: |
03 Nov 2006 11:40:09 PM |
| Object: |
Einstein E=mc2 . Should Newton , De Pretto , Preston, Hasenohrl and Soddi, Planck be given credit for discovery of E=mc2. ? |
Einstein=E2=80=99s E=3Dmc2 . Should Newton , De Pretto , Preston, Hasenohrl=
and
Soddi, Planck be given credit for discovery of E=3Dmc2. ?
The French chemist Antoine Lavoisier (1743-1794) was the first to
formulate a law of conservation of matter in chemical reactions. The
concept of inter-conversion of mass and energy has been studied by
various scientists qualitatively, even before Einstein.
1=2E Newton has quoted in his book =E2=80=98Opticks=E2=80=99 in 1704 that
"Gross bodies and light are convertible into one another...",
After about 200 years Einstein derived mathematical equation for
Newton=E2=80=99s perception i.e. =E2=88=86L =3D=E2=88=86mc2 where =E2=88=86=
L is light energy
emitted when mass =E2=88=86m is annihilated and is speed of light. It is the
rarest coincidence in between Newton=E2=80=99s hypothesis and Einstein=E2=
=80=99s
mathematical derivation.
2=2E S. Tolver Preston proposed that a vast amount of energy can be
produced from matter in his book Physics of the Ether in 1875. Preston
determined that one grain could lift a 100,000-ton object up to a
height dmc2.=EF=82=B5of 1.9 miles. This deduction yields dE
3=2E Jules Henri Poincar=C3=A9 in 1900 applied the calculations in a recoil
process and reached at the conclusion in the form, mv =3D (E/c2)c. From
the viewpoint of dimensional analysis, E/c2 takes on the role of a
=E2=80=98mass=E2=80=99 associated with radiation, which yields E=3Dmc2.
4=2E Olinto De Pretto speculated E=3Dmc2, implying that when v=3Dc , then E=
=3D
mv2 becomes E=3Dmc2 , in 1903-04. But Pretto neither gave specific
derivation nor mathematical calculations. Bartocci claimed that
Einstein was aware of De Pretto=E2=80=99s speculation of E=3D=E2=88=86mc2 ,=
which was
published about a year before.
5=2E Fritz Hasenohrl in 1904, concluded: =E2=80=9Cto the mechanical mass of=
our
system must be added an apparent mass which is given by, m=3D8E/3c2 where
E is the energy of the radiation.=E2=80=9D In a later paper he further
improved result that mass exchanged is, m=3D4E/3c2. Ebenezer Cunningham
in 1914 in the book The Principles of Relativity showed that F.
Hasen=C3=B6hrl, had made a slight error in his calculations. If errors are
removed then the mass exchanged is m =3DE/c2 or E =3D mc2. Thus in this
regard Hasenohrl=E2=80=99s contribution is the most significant, before
Einstein.
6=2E Frederick Soddi and M. Henri Becquerel both have predicted that in
radioactive emissions the mass of body decreases i.e. energy of
radiations is at the cost of mass.
7=2E Max Planck in 1907 made an in-depth investigation of the energy
"confined" within a body, but he did not use Einstein=E2=80=99s approach at
all. Planck derived an expression m-M=3D E/c2, for heat energy and mass
and interpreted that
=E2=80=9D The inertia mass of body is altered by absorption or emission of
heat energy. The increments of mass of body are equal to heat energy
divided by square of speed of light.=E2=80=9D
Planck acknowledged Einstein=E2=80=99s previous derivation but did not agree
with correctness of Einstein=E2=80=99s derivation.
Should these scientists be given credit of doing basic work in
assisting the discovery of E=3Dmc2 ?
Today, E=3Dmc2 is regarded a sole province of Einstein.
Complied from various sources.
If some scientists is left , please add. I think one is JJ Thomson
Main sources for compilation
100 Years of E=3Dmc2
https://www.novapublishers.com/catalog/product_info.php?cPath=3D23_48_324&p=
roducts_id=3D4554
_________________
https://www.novapublishers.com/catalog/product_info.php?cPath=3D23_48_324&p=
roducts_id=3D4554
.
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| User: "Bill Hobba" |
|
| Title: Re: Einstein E=mc2 . Should Newton , De Pretto , Preston, Hasenohrl and Soddi, Planck be given credit for discovery of E=mc2. ? |
04 Nov 2006 12:55:07 AM |
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|
"AJAY SHARMA" <physics.einstein@gmail.com> wrote in message
news:1162618809.458652.109600@m7g2000cwm.googlegroups.com...
Today, E=mc2 is regarded a sole province of Einstein.
No its not. It is generally acknowledged other scientists made
contributions eg Poincare. However Einstein was the first to derive it from
SR. For the facts see Pias - Subtle Is The Lord.
Bill
.
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| User: "AJAY SHARMA" |
|
| Title: Re: Einstein E=mc2 . Should Newton , De Pretto , Preston, Hasenohrl and Soddi, Planck be given credit for discovery of E=mc2. ? |
04 Nov 2006 10:43:05 AM |
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|
Bill Hobba wrote:
"AJAY SHARMA" <physics.einstein@gmail.com> wrote in message
news:1162618809.458652.109600@m7g2000cwm.googlegroups.com...
Today, E=mc2 is regarded a sole province of Einstein.
No its not. It is generally acknowledged other scientists made
contributions eg Poincare. However Einstein was the first to derive it from
SR. For the facts see Pias - Subtle Is The Lord.
Bill
.
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