Questions tagged [energy]
31 questions
2
votes
1 answer
When was the energy of the electron first measured?
Can you give a few details? where/how was it measured, was the value .511MeV found right away, etc..
Readers who'd like a proper answer to the question may find this link useful.
The value found by this experiment is .537 MeV
I do hope that someone…
user157860
- 703
- 3
- 11
2
votes
0 answers
How exactly was the principle of conservation of energy discovered?
How did we come to know that, for example, the quantity Work=Force*distance is conserved?
Khalid T. Salem
- 121
- 1
1
vote
1 answer
Was annihilation considered in 1905?
The positron was discovered in 1932, did physicist have any knowledge or assumed that matter could be annihilated into energy at the start of XX century?
user157860
- 703
- 3
- 11
1
vote
1 answer
When was relativistic mass first observed?
I counldn't find precise info on who/ when successfully observed relativistic mass increase. The only thing I found by a Google search is that it was first confirmed in 1908 in experiments with electrons in cathode tube.
But I know that in 1905…
user157860
- 703
- 3
- 11
1
vote
0 answers
During which period did the name Work-Energy theorem enter physics discourse
Throughout the centuries the label 'principle' has been applied liberally. That blurs the lines, it devaluates the word 'principle'.
As an example of a good use of the word 'principle' the Principle of relativity of inertial motion comes to…
Cleonis
- 804
- 3
- 10
-2
votes
1 answer
Was the equivalence of mass-energy referred to the rest or kinetic mass?
Can you explain if einstein's M=C refers to the rest mass of the electron which iss turned into energy by annihilation or to the relativistic/ electromagnetic mass or both?
Since at the time positron, antimatter and annihilation was not known I…
user157860
- 703
- 3
- 11