在戴维逊-革末实验中,电子的能量至少应为[tex=2.857x2.643]nOlj4uLtx9hcXMEmZMw1Wrj4qzFfZtc75FtPXTqns5N0Hmz7bz9b0vS+ECPoLq2d[/tex]。如果所用镍晶体的散射平面间距[tex=5.571x1.0]eh5yRvXmmog4jhcdHfTTendDKslL7CedSRWx4kFwdrY=[/tex],则所用电子的最小能量是多少?
举一反三
- 在戴维逊-革末实验中,电子的能量至少应为 [tex=2.857x2.643]nOlj4uLtx9hcXMEmZMw1Wn+xWttIr59Q782wA6y3OyI=[/tex]。 如果所用锦晶体的散射平面间距 [tex=5.357x1.214]chEk7JVrHPiw2TdNs9fBqg==[/tex]则所用电子的最 小能量是多少?
- 【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]
- >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为? A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- 【计算题】5 ×8= 6×4= 7×7= 9×5= 2×3= 9 ×2= 8×9= 7×8= 5×5= 4×3= 5+8= 6 ×6= 3×7= 4×8= 9×3= 1 ×2= 9×9= 6×8= 8×0= 4×7=