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  1. Radiation does not require medium Radiation is transfer of heat through electromagnetic radiation in the heat spectrum. Hot or cold, all objects radiate ...

  2. ..., but there are telescopes for most of the spectrum of electromagnetic radiation and for other signal types. An optical telescope gathers and ... ...

  3. ...capable of producing elastic restoring forces), waves of electromagnetic radiation (and probably gravitational radiation) can travel through vacuum, ...

  4. ...plastic. Analogous devices used with other types of electromagnetic radiation are also called lenses: for instance, a microwave lens can be ...

  5. ...don’t have to be afraid if they know which type of radiation it is. An electromagnetic wave radiation includes communication electric wave and ...

  6. .... Electrical machines, especially electromagnetic motors and generators. Electrical...microwave ovens. Wave guides for microwave radiation. Inte ...

  7. ...卻是一個疑問;一些報道指出,手提電話發出強力輻射(radiation),使用時接近用者頭部,會產主不良影響,甚至引致...)兩大類:電離輻射能量極高,如電磁頻譜(el ...