(September 18, 2022 at 7:02 pm)BrianSoddingBoru4 Wrote:(September 18, 2022 at 6:21 pm)polymath257 Wrote: No, it is actually the case.
It is typical, for example, to talk about the brightness of a radio emission or an x-ray emission.
Brightess is usually considered to be equivalent to luminosity.
It isn’t. Brightness is (unsurprisingly) how bright an object appears to an observer. Luminosity refers to total EMR emissions.
To speak of the ‘brightness’ of a radio or x-ray emission may be typical, but it isn’t correct.
Boru
It is standard usage among physicists. You can even talk about the brightness of an infrared laser.
In these matters, standard usage defined correctness.