30. A neutron has a mass of 1.67 ✖ 10-27 kg. Its de Broglie wavelength is 1.4 ✖10-10 m. What is its kinetic energy (h=6.626 ✖10-34m2kg/s) ?
(A) 40 eV
(B) 4 eV
(C) 0.4 eV
(D) 0.04 eV
(E) 0.004 eV
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統計: A(0), B(0), C(2), D(4), E(1) #3224676
統計: A(0), B(0), C(2), D(4), E(1) #3224676