Example 1. What wavelength is predicted by De broglie wave for a bullet whose mass is mo=0.05kg and velocity is v=300m/s? olve V<<C h663×10-34 44×10-3(m)即44×1024A 0.05×300 Exp 2. What wavelength is predicted by De broglie wave for a beam of electrons whose kinetic energy is eu and velocity n isv? (V<<C) B From the law of KE mo y conservation of energy 发射电 e -mv=el 子阴级U加速电极Example 1. What wavelength is predicted by De Broglie wave for a bullet whose mass is m0=0.05kg and velocity is v=300m/s? Solve, ∵V << C 4.4 10 ( ) 0.05 300 6.63 10 3 5 3 4 0 m m V h − − =     = = 即4.410-24Å U B K 发射电 子阴级 加速电极 e m0 V  Exp 2. What wavelength is predicted by De Broglie wave for a beam of electrons whose kinetic energy is eU and velocity is v ? （VC） m V = eU 2 0 2 1  From the law of conservation of energy