電磁波

1. Origins, structure, and basic meaning

• Structure: 電磁波 is read as でんじは and is a noun for an electromagnetic wave, in which changing electric and magnetic fields propagate through space.
• Basic usage: Classification appears in 光も電磁波の一種, while a measured emission appears in 装置から出る電磁波を計測する.

2. Common pitfalls and similar expressions

• A range that includes light
  • Visible light is also a type of electromagnetic wave, so the term is not limited to waves used for communication.
• Difference from 電波
  • 電波 often refers to radio waves used for communication or broadcasting, while 電磁波 is the broader physical category that also includes light.