Anonymous

There is no limit. And what kind of radiation?

Anonymous

the size of the entire universe.

Anonymous

For electromagnetic radiation, that would be 0 hertz - an infinitely long wavelength. https://www.emf-portal.org/uploads/Frequ...

Anonymous

Long waves - radio waves. Submarines make use of this, as they’re the only form of radio that can penetrate hundreds of feet of seawater - but, because they are so long, only 1 character can be received at a time, very slowly...

Anonymous

Long wave radio waves...around 1500 m.

Anonymous

What _type_ of radiation? It's a meaningless word unless you specify what is being radiated.

Anonymous

There's really no limit to the maximum wavelength but gravitational waves are the longest we've detected.