Einstein's Mass-Energy Equivalence

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In summary, The conversation was about the symbols \eta_{0,x,y,z) and u_{\mu} and their meanings in physics. \eta_{0,x,y,z} represents the components of the four-velocity, while u_{\mu} represents the four-velocity itself. The symbol \eta is used for the metric tensor in physics, which represents the flat Minkowski spacetime. In Neogreek, \eta is pronounced ITA and in Ancient Greek, it is pronounced ETA.
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quasar987
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  • #3
As it often happens I found the answer to my question while typing it :tongue2:

[itex]\eta[/itex] was for the proper speed... i.e. [itex]\eta_{0,x,y,z}[/itex] are the components of the four-velocity. What symbol do you use?
 
  • #4
Ita is for the metric...[itex] u_{\mu} [/itex] is the four-velocity...

Daniel.
 
  • #5
What's a 'metric' ?
 
  • #6
A distance,in mathematics (a metric space is a topological space with a metric)...Here,in physics jargon,it stands for the metric tensor [itex] g_{\mu\nu} [/itex] for spacetime and for the flat Minkowski spactime [itex] \eta_{\mu\nu} [/itex]

Daniel.
 
  • #7
quasar: [itex]\eta[/itex] is pronounced like something between etta and ayta; not eeta.
 
  • #8
In Neogreek it is pronounced ITA (eeta,if u want to).True,in Anciant Greek it's ETA...

Daniel.
 

What is Einstein's Mass-Energy Equivalence?

Einstein's Mass-Energy Equivalence, also known as E=mc^2, is a famous equation that demonstrates the relationship between mass and energy. It states that the mass of an object is equal to its energy divided by the speed of light squared.

How did Einstein discover the Mass-Energy Equivalence?

Einstein first proposed the concept of mass-energy equivalence in his famous paper "On the Electrodynamics of Moving Bodies" in 1905. He based his theory on the principles of special relativity and the idea that energy and mass are interchangeable.

What are the practical applications of the Mass-Energy Equivalence?

The Mass-Energy Equivalence has many practical applications, including in nuclear energy and nuclear weapons. It is also used in medical technologies such as positron emission tomography (PET) scans.

Does the Mass-Energy Equivalence apply to all forms of energy?

Yes, the Mass-Energy Equivalence applies to all forms of energy, including potential energy, kinetic energy, and thermal energy. However, it is most commonly associated with the conversion of mass to energy in nuclear reactions.

Is the Mass-Energy Equivalence a proven theory?

Yes, the Mass-Energy Equivalence has been extensively tested and confirmed through experiments. It is considered to be one of the fundamental principles of modern physics and is widely accepted by the scientific community.

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