[RadioAstronomer]

None. But what I lack is physical confirmation of the length of one microwave

Ever hear of a magnatron or waveguide?

[Fester Chugabrew]

Ever hear of a magnatron or waveguide?

Yes. Unfortunately I don't have one at home. Would you please lend me yours? It would be helpful if you also gave some general instruction as to how I can make use of those tools. Do I need to plug in the microwave? Which waves do I measure, the light waves or the microwaves? Which one will tell me the precise age of the earth? Also, has the entire wave spectrum been defined by science for all time?

No need for citations or links. I'll accept your plain answers.

[Gumlegs]

Oh, you've just heard of those because someone told you about them.

OR ...

Oh, you've only seen them. Who you gonna believe, me or your own eyes?

< /Chugabrew>