.

Regarding this, does silver or white reflect more heat?

Other than the convective and conductive heat transfer due to the ambient air, absorbed sunlight raise the cars temperature. White paints absorb <10% of sunlight so the heat input is limited. Grey or silver paint absorbs ~ 30% of the sunlight. Black paint absorbs >85% of sunlight.

One may also ask, what is the best color to reflect heat? White, red and yellow are best for the warm months when you want to avoid attracting extra heat. In cool months, those same colors are best traded for blue, violet or black when you want to trap as much heat as possible.

Just so, do silver cars reflect heat?

It's intuitive to think that a white or silver car will attract less heat than a black or dark brown car. A black car left out in the sun had an internal temperature about 10 degrees warmer than a silver car in the same circumstances; the latter can reflect about 60 percent of sunlight.

Does silver reflect light?

Isolated silver atoms do not reflect light. Silver metal reflects light, and even then only when polished into a nice smooth surface sufficiently large.