- #1
sunroof
- 20
- 0
Einstein proposed a very simple derivation to E=mc^2 in 1940s which is well-known as Einstein’s box and a brief introduction is in
http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html . If this event occurs in media instead of vacuum, the light speed should be u=c/n rather than c. Thus, the momentum is Mv=E/u and time is t=L/u. The result is now E=mu^2 and will be reduced to E=mc^2 only in vacuum.
E=mc^2 is not universal?
http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html . If this event occurs in media instead of vacuum, the light speed should be u=c/n rather than c. Thus, the momentum is Mv=E/u and time is t=L/u. The result is now E=mu^2 and will be reduced to E=mc^2 only in vacuum.
E=mc^2 is not universal?