Hello, I'm an English student and external candidate, hoping to take my Physics with me through life. I have some questions regarding a topic I'm researching, currently. I have a book "Advanced Physics - Steve Adams, Jonathan Allday", which details 'Blackbody Radiation', as evidence for a particular nature of light. I imagine a blackbody, emitting light from the thermal energy generated inside the box. The energy of this light will correspond [E ∝ f], where 'E' is the transferred energy from material oscillation, to photonic oscillation, and 'f' is the frequency of the light. I can accept this, as it's an observational fact. The more energy that is heating the box, the higher the frequency of the emerging light. Now, an "Ultraviolet Catastrophe" came about, when physicists plotted the relationship between the energy and the emerging light, as they concluded the low wavelengths - and respectively high frequencies [C = fλ] - of light, would have an asymptotic correspondence with the energy of the light. Integrating this would yield an infinite sum of energy, and that's weirdness that we generally avoid. Supposing an infinitely increasing frequency, I would assume that, yes, as frequency approaches ∞, energy will approach ∞. How does quantising the energy solve this? Why is [E = hf] any different from [E ∝ f]? 'h*f' still tends to infinity, as 'f' tends to infinity. The other worry I have, is about 'f' actually tending to infinity. I've seen the electromagnetic spectrum, and I'm sure that it's not infinite. If [Ek ∝ v2], then there's only a maximum amount of energy that light can have? I require a good explanation, please, as I'm really struggling with this. -EDIT- I am now familiar with the Rayleigh-Jeans law (unfortunately not with the derivation of it, though), and can see how it would predict an infinite sum of energy for the radiance. This does not clear up how Planck and Einstein solved this, though.