Calculate the mass and velocity of 2 MeV electron. *
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Answer:
Effective mass m
eff
=
0.511
9.1×10
−31
×2
=35.61×10
−31
kg
Mass of moving electron =
1−(
c
u
)
2
m
rest
35.6×10
−31
=
1−(
3×10
10
u
)
2
9.1×10
−31
15.3=
1−(
3×10
10
u
)
2
1
0.065=1−(
3×10
10
u
)
2
0.935=(
3×10
10
u
)
2
u=2.9×10
10
cm/s
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