/sci/ - Science & Math

How can white light contain all the colors if the colors are different wavelengths? How can a wave have multiple frequencies?

Pic related. If you are not trolling which seems unlikely.

I've read that the hotter the object, the more waves of higher frequencies are emitted. So that if some object is not so hot, it will emit red, and if it's hotter, it will emit, red and more colors now, and so on.

Do hot objects emit all the wavelengths of lower frequencies when they're hot, if they already emit visible light?

And how many wavelengths do they emit for each frequency range (I don't even know how to form the question properly)? Obviously, if they emitted every single wavelength/all the wavelengths even on the visible spectrum, then the amount of energy emitted would be infinite, which is obviously impossible.

Even if the emission spectrum was a small red band, but which was drawn for all the wavelength values, then the energy emitted would be infinite. What are the limits of wavelength emission? Sorry, I don't really know how to form this question properly as I lack proper terminology.