What would the properties of an infinitely long wavelength of light be? And what about a wavelength of light that is infinitely short? What would that look like?
edit: light as in electromagnetic waves, not visible light. Sorry if it was not very clear
Now do the shortest possible wavelength. World-ending yes or no?
Gamma radiation? Basically the fallback energy output of nature.
If I’m not mistaken, their last paragraph describes this to contrast the answer above about the longest (I.e. lowest) frequency.