推荐回答(3个)
在真空中 是相同的 因为没有东西阻挡
在介质中 果断不相同 比如水中和空气中 玻璃中 红光必然比紫光快
波长问题
不知道你是大学还是初中
我说简单点吧 光是电磁波 你理解么?
无线电 电报啊无线电话啊 也是电磁波你理解么?
都是电磁波 果断是光比无线电快吧
就是因为 这两种波 波长不同 频率不同 所以速度也不同
不同颜色的光 波长也不同
总体说 光速比其他电磁波快 但光和光有区别哦
再比如说 红黄光 穿透力强 大雾时 这两种颜色的光比较明显 你理解吧?
那么也就是说 绿蓝光 穿透力不强 因为波长问题 易受阻挡 遇到阻挡了 就消耗能量
能量少了 速度就没了 因此绿蓝光传不远
上面这俩例子 应付初中老师就行了
再正式点的例子
比如 暗室里 窗户上一个小洞进来一束阳光 光透过三棱镜后 形成光谱 红光在上 紫光在下
红光偏折角度小 紫光偏折角度大
本来光源是个小点 为什么折射后 几种色光被分开了 说明折射率不同 根本还是因为 色光速度不同 红光速度快 受折射的影响角小 所以角度改变的少 紫光慢 所以受影响大 所以改变角度大
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