Highest frequency Superman has ever heard.

[RedSunOfKrypton]

Anybody know?

[Captain Kal]

The Pre Crisis version and the Birthright version can perceive radio and microwave transmissions with super-hearing.  That would put the known upper limits between about 100 million hertz for radio frequencies to 100 billion hertz for microwaves.

[RedSunOfKrypton]

Cool, thanks CK. Is that RF/MW number based on his hearing being EM based though (Like we talked about when discussing the fact that he hears "faster than the speed of sound")?

[SteamTeck]

it would pretty much have to be then wouldn't it . Maybe he has  two types of "hearing".

[RedSunOfKrypton]

Well yeah, that was pretty much our concensus (well how I interpreted it anyway) , because I don't think HF sound can be detected as RF e.g. I don't think it spontaneously becomes radiowaves once its frequency gets high enough, I could be wrong though, it's been known to happen.

[Captain Kal]

Since I'm always learning new things, I've had occasion to rethink this question based on what I've learned about ultrasonics.

If we're talking about sounds in our air, then the highest possible frequency that he could hear -- limited by the air itself -- would be a few megahertz somewhere below 10 megahertz.

Given different media like water, steel, etc. that frequency would change.

As noted on the previous thread, he has been capable of hearing radio frequencies which aren't limited by air's limitations.

[Klar Ken T5477]

So he and Krypto can hear Man-Bat's echolating Skree Skree then?   :wink:

[dto]

Strange... I don't have super-hearing, but even I just now detected a Skree Skree echo...   :wink: