波動(粵拼:bo1 dung6;英文:waves),好多時簡稱波,係通過空間傳遞能量嘅一種擾動。機械波要通過物質傳,而電磁波就可以真空傳。
波可以由一點傳到去另一度,唔使點郁到媒介嘅粒子,淨係靠粒子喺自己位度振。
喺物理學上,波動係指
-好似係水上面嘅波浪就可以噉想像:喺呢種波動當中,來回變化緊嘅物理量係粒子嘅位置 , 數值會喺 、0 同 之間來回噉郁嚟郁去,而呢股「令粒子來回上下郁」嘅力量仲會沿住水面傳開去。波動-包括波浪、聲同光在內-有好多物質冇嘅特性,例如係曉折射同繞射呀噉。至於要點樣證實光係種電磁性質嘅波動(電磁波),可以睇吓麥士維方程組相關嘅內容。
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證明:
睇正弦波
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