代入数据:\[ 50 = 3 \times 10^8 \times 0.2 \]解得:\[ c = 1.25 \times 10^7 m/s \]根据电磁波的波长和频率关系:\[ c = \lambda \times f \]代入光速和波长关系:\[ 1.25 \times 10^7 = \lambda \times f \]假设频率为 \( f \),则波长为:\[ \lambda = \frac{1.25 \times 10...