22688 |
22688 |
22286 |
22688 |
22286 |
22688 |
22688 |
22286 |
42 |
v2 |
R |
mv |
qB |
qαBRα |
mα |
2×1.6×10-19×0.5×1 |
4×1.67×10-27 |
1 |
2 |
1 |
2 |
P2 |
2m |
Ek(Rn) |
EK(α) |
mα |
mRn |
4 |
222 |
4 |
222 |
226 |
222 |
226 |
222 |
22688 |
22688 |
22286 |
42 |
22286 |
N+1 |
A.等于3m/s | B.小于1m/s | C.等于1m/s | D.大于1m/s |
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