There are 9 candles that are lit on Hanukkah. One is the helper candle ("shamash") used to light the other 8, which symbolize the 8 days of Hanukkah. A story in the Talmud (500 years after the...
the question is phrased poorly, but i think the answer is seven, as in white light is split into seven different wavelengths when passed through a prism.