Question concernig E=MC^2

  • Thread starter whatzzupboy
  • Start date
  • Tags
    E=mc^2
In summary, the equation E=mc^2 relates the mass (M) of a particle to the speed of light (C) in a vacuum.
  • #1
whatzzupboy
60
0
What do the variables M and C reffer to, in the equastion E=MC^2?
 
Physics news on Phys.org
  • #2
C stands for the speed of light I think and I know M stands for mass.
 
  • #3
m = relativistic mass of the particle in question
c = the speed of light in a vacuum, ~300,000km/s
 
Last edited:
  • #4
i thought the speed of light was 299,292.6Km/S
 
  • #5
i thought that it depend on the environment where is the light, so the velocity of light in air is different than in water or glass . see more about diffraction of light
 
  • #6
ok well I am basing the equastion out side the universe so... what then is C?
 
  • #7
whatzzupboy said:
ok well I am basing the equastion out side the universe so... what then is C?

C is the speed of light in a vacuum
 
  • #8
irrehaare said:
i thought that it depend on the environment where is the light, so the velocity of light in air is different than in water or glass . see more about diffraction of light

Well the speed of light can change, but as far as the formula goes, you are able to determine the energy based off of its maximum speed i think. Since you can make it so that there's no actual light flying around in an isolated nuclear reaction, there's no speed to base a change in c off of.
 
  • #9
whatzzupboy said:
ok well I am basing the equastion out side the universe so... what then is C?

Outside the universe? Wheres that? Why would there be light there?
 
  • #10
whozum said:
Outside the universe? Wheres that? Why would there be light there?

And what matter would there be "outside the universe"?
 
  • #11
whatzzupboy said:
ok well I am basing the equastion out side the universe so... what then is C?

You've been told what c is several times now. (And that "out side the universe" makes no sense.)

Pengwino said:
c = the speed of light in a vacuum, ~300,000km/s

Did you mean "outside the atmosphere" (i.e. in vacuum) rather than "out side the universe"?

whatzzupboy said:
i thought the speed of light was 299,292.6Km/S
Do you know what "~" means?
 
  • #12
HallsofIvy said:
You've been told what c is several times now. (And that "out side the universe" makes no sense.)



Did you mean "outside the atmosphere" (i.e. in vacuum) rather than "out side the universe"?


Do you know what "~" means?

Owned. But I thought the "C" was the speed of light in meters which would make it ~300,000,000 m/s. What difference does it make? In multipling, you would be multipling by 300,000,000 instead of 300,000.
 
Last edited:
  • #13
I suggest you keep you "owned" and "pwned" for yourself. Please.

Btw, I'm not sure I understand your post. When you say "What difference does it make?", are you saking yourself a question and then answering it, or are you really asking that question? Cuz my answer would be: "In so far as every unit system is as good as any other, it makes no difference wheter you take 'c' to be 300,000 km/s, 300,000,000 m/s or 1 M/s, where I have define the lengh 1M to be equivalent to 300,000,000 m (I heard this is what particle physicists use as the unit of length in their calculations)
 
  • #14
xFlankerx said:
Owned. But I thought the "C" was the speed of light in meters which would make it ~300,000,000 m/s. What difference does it make? In multipling, you would be multipling by 300,000,000 instead of 300,000.

C can be done in any length. Heck it can be done in feet or centimeters or Earth's!
 
  • #15
[itex]E=mc^2[/itex] is basically an idea that when 'm' mass is annihilated , a radiation carrying energy 'E' will be radiated , signifying the idea that mass is a sort of condensed form of energy . In this equation 'c' is the light speed in vacuum , though light speed varies with the medium apparently , the photons that make up the light always move at this constant 'c'.

BJ
 
  • #16
xFlankerx said:
Owned. But I thought the "C" was the speed of light in meters which would make it ~300,000,000 m/s. What difference does it make? In multipling, you would be multipling by 300,000,000 instead of 300,000.

Oh, dear! I completely missed the "missing" 000!
 
  • #17
quasar987 said:
I suggest you keep you "owned" and "pwned" for yourself. Please.

Btw, I'm not sure I understand your post. When you say "What difference does it make?", are you saking yourself a question and then answering it, or are you really asking that question? Cuz my answer would be: "In so far as every unit system is as good as any other, it makes no difference wheter you take 'c' to be 300,000 km/s, 300,000,000 m/s or 1 M/s, where I have define the lengh 1M to be equivalent to 300,000,000 m (I heard this is what particle physicists use as the unit of length in their calculations)

Sorry, its just a habit. I'll try to keep it to myself from now on. And I was asking the question in anticipation of someone else asking it, so I answered it as I thought fit in the next sentence.

HallsofIvy said:
Oh, dear! I completely missed the "missing" 000!

Sarcasm or not? I can't tell.
 
  • #18
How can people think that 300,000km/s is different then 300,000,000 m/s?
 
  • #19
whatzzupboy said:
i thought the speed of light was 299,292.6Km/S

To be exact, the speed of light in a vacuum is actually 299,792.458 km/s.

hk
 
  • #20
irrehaare said:
i thought that it depend on the environment where is the light, so the velocity of light in air is different than in water or glass . see more about diffraction of light

If the object in question is a particle then the E in the relation [itex]E = mc^2[/itex] is the inertial energy of the particle. c is the speed of like in a vacuum and has the value c = 299,792,456.2 m/s. m is the mass of the particle (and yelling will ensue if I don't point out that I'm speaking of relativistic mass). If the object is not a particle but a closed system of free particles or it is an object of finite size which is isolated in space then the same thing applies.

Pete
 

1. What does the equation E=MC^2 mean?

The equation E=MC^2 is known as the mass-energy equivalence equation and is a fundamental concept in physics. It states that energy (E) is equal to the mass (M) of an object multiplied by the speed of light squared (C^2).

2. Who created the equation E=MC^2?

The equation E=MC^2 was created by Albert Einstein in 1905. It was first introduced in his paper "Does the Inertia of a Body Depend Upon Its Energy Content?" published in the journal Annalen der Physik.

3. What is the significance of E=MC^2?

E=MC^2 is significant because it explains the relationship between mass and energy. It showed that mass and energy are two forms of the same thing and can be converted into one another. This led to the development of nuclear energy and has had a major impact on modern physics.

4. Can E=MC^2 be applied to everyday life?

Yes, E=MC^2 can be applied to everyday life in various ways. For example, it is used in nuclear power plants to generate electricity and in medical imaging techniques such as PET scans. It also plays a role in the production of nuclear weapons and in understanding the behavior of stars.

5. Is E=MC^2 the most famous equation in physics?

E=MC^2 is definitely one of the most famous equations in physics, but it is not the only one. Other notable equations include Newton's second law of motion (F=ma) and the law of universal gravitation (F=G(m1m2)/r^2). However, E=MC^2 is often considered the most famous because of its groundbreaking implications in the field of physics.

Similar threads

Replies
8
Views
2K
  • Introductory Physics Homework Help
Replies
2
Views
749
  • Introductory Physics Homework Help
Replies
3
Views
491
  • Introductory Physics Homework Help
Replies
6
Views
867
  • Introductory Physics Homework Help
Replies
1
Views
793
  • Introductory Physics Homework Help
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
2
Views
724
  • Special and General Relativity
Replies
17
Views
1K
  • Introductory Physics Homework Help
Replies
23
Views
1K
Replies
8
Views
696
Back
Top