A.0.5mec2 B.mec2
C.1.5mec2 D.2mec2
(式中c为真空中光速)
[单选题]当电子的动能等于它静止的能量时,用me0表示电子的静止质量,c表示真空中的光速,h表示普朗克常数,则该电子的德布罗意波长是()。A.B.C.D.
[单选题]电子的静止质量为4.586×10-4,()MeV/C2。A.0.510B.0.511C.0.512D.0.513
[单选题]---- Excuse me. Could you tell me ___________?---- Yes, There is a video shop next to the tall building.A. where can I buy some CDs B. where I can buy some CDsC. when can I buy some CDs D. when I can buy some CDs
[单选题]电子的静止质量为 4.586×10-4u=()MeV/C2。A.0.425B.0.426 C.0.427D.0.428
[判断题] 设电子质量为m,电量为Q,由静止状态直线加速到具有速度v时,其所需电压是Qmv/2。A . 正确B . 错误
[单选题]The scene has shocked me because it is something alien to me.A.He works in
[问答题]()Everyone was in bed except me.
[单选题]The letterwithout the address [puzzled] me.A.perplexedB.interestedC.trouble
[单选题]已知电子的静能为0.51MeV,若电子的动能为0.25MeV,则它所增加的质量△m与静止质量m0的比值近似为()。A.0.1B.0.2C.0.5D.0