题型:问答题 简答题 光子的能量为hv,动量的大小为hvc.如果一个静止的放射性元素的原子核在发生γ衰变时只发出一个γ光子,则下列说法错误的是( )A.衰变后的原子核仍然静止B.衰变后的原子核沿着与光子运动方向相反的方向运动C.该过程中质量亏损为hvc2D.该过程中质量亏损大于hvc2 查看答案
题型:问答题 简答题 The present financial crisis has greatly contributed to thousands of workers________and many factories .A.laying off, closed downB.laid off, closed downC.laid off, closing downD.being laid off, closing down 查看答案