关于探照灯照射的光斑速度

On the velocity of light spot from the search light

光速(真空中)是自然界物体运动或信息及能量传递的极限,如果不注意这个条件,一般地谈速度,那么,找寻超光速的现象并不是难事.有些教科书上时常以探照灯光斑移动的速度来阐述这种超光速现象,演算得到光斑移动的速度为v=hωcos2θ.本文指出,此结果是错的!对正确结果做的定量计算表明:光斑速度虽仍然能超光速,但正确结果的超光速条件远比错误结果的超光速复杂,而且物理含义也更加丰富.

Velocity of light, in the vacuum, is the utmost of natural matters＇ movements or information and energy convey. Regardless of this condition, it＇s not so difficult to find super velocity of light as far as velocity is normally concerned. Some text books often take the example of the light spot movement from the search light to testify the phenomenon of super velocity of light. Through their derivation, the velocity of light spot is v=hω/cos^2θ The es-say, however, indicates the result wrong! According to the calculation for the right result, though the velocity of light spot can surpass the velocity of light, the right resuh＇s condition on the super velocity of light is far more complicated than the wrong one＇s, and theoretically richer in physics.