The rest energy of an electron (m = 9.11 × 10-31 kg) in eV is:
Question 8 options:
A)
0.856 meV
B)
1.70 meV
C)
0.174 MeV
D)
0.256 MeV
E)
0.512 MeV
The formula for rest energy (E) is:
E = mc^2
where m is the mass and c is the speed of light.
Substituting the values:
E = (9.11 × 10^-31 kg) x (3 x 10^8 m/s)^2
E = 8.19 x 10^-14 J
To convert J to eV, we can use the conversion factor:
1 eV = 1.6 x 10^-19 J
Therefore,
E = (8.19 x 10^-14 J) / (1.6 x 10^-19 J/eV)
E = 5.12 x 10^5 eV
Therefore, the correct answer is E) 0.512 MeV.