wave length of sound

例句：

1. 1. The scientist measured the wave length of the light to determine its frequency.
   科学家测量了光的波长来确定其频率。
2. 2.The new technology can accurately measure the wave length of a specific material.
   新技术可以准确地测量特定材料的波长短。
3. 3. The wave length of the sun's rays is 90 million kilometers.
   太阳光线的波长是9亿公里。