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Conservation Of Mass and Energy -
Mass can’t be created or destroyed but can be converted into
energy according to the formula

Mass (kg) to Energy (J) Equation
|
E |
= |
m |
c2 |
|
Units (J) |
|
(Kg) |
m/s |
c - speed of light = 3.00 x 108 m/s
Ex) How much energy would you get if you converted 2.0 Kg to
energy?
|
E |
= |
m |
c2 |
|
Units (J) |
|
(Kg) |
m/s |
E =
2.0Kg(3.00 x 108 m/s)2
E = 1.8 x 1017 Joules
Finding the energy that can be obtained from the conversion of
1
proton (1 universal mass unit)
mass of a proton = 1.67 x 10-27 Kg
(p. 1 reference)
Plug into equation E= mc2
E = (1.67 X 10-27 Kg)(3 x 108
m/s)2
= 1.5 x 10-10
Joules
Convert to eV:
1 eV = 1.6 x 10
-19 Joules
E = 1.5 x 10-10 Joules/1.6 x 10 -19 J/eV
Joules
= 9.31 x 102
Mev or 931 MeV ***
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To convert universal mass units
to
energy in MeV
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|
1 proton (universal mass unit)
converts to
9.31 x 102 Mev
or 931 MeV p. 1 Reference |
page 1 Reference (Mass/Energy Relationship)
Typical Regents Question - How much energy can be
generated when 2 universal mass units are completely converted into energy?
Answer: 1862 MeV
(each universal mass unit converted produces 931 MeV)
Forces inside nucleus
1) Strong nuclear force
(AKA strong force) - holds nucleus together -
very strong, short range
• operates at distance < 10-13 m
A) Binding Energy - amount of energy needed to
separate nucleons (protons and neutrons) in nucleus.
Protons and neutrons in nucleus weigh slightly less than free
neutrons and protons
Mass of Assembled Nucleus < Combined mass of an equivalent # of nucleons.
Lost mass called mass defect -
**Mass Defect
= binding energy **
(mass lost is converted to energy)
If the mass defect is .1 universal mass units then the binding
energy =
p. 1 Reference
Universal mass unit converts to
9.31 x 102 Mev
Answer: 9.31 x 101
Mev
This movie is part of the collection:
Prelinger Archives
Producer: Sutherland
(John) Productions
Sponsor: General
Electric Company
Audio/Visual: Sd, C
Keywords:
Atomic-nuclear: Energy;
Physics;
Animation
Creative Commons license:
Public Domain
Subatomic
Particles
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