Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: A vapor light also produces visible light by electroluminescence The bulb contains a small amount of solid sodium or mercury as well as a mixture of neon and argon gases. When an electric current passes through the gases, it causes the solid sodium or mercury to change to a gas and emit visible light. Sodium vapor lights, like the streetlight pictured in the Figure below , produce yellowish light. Mercury vapor lights produce bluish light. In addition to lighting city streets, vapor lights are used to light highways and stadiums. The bulbs are very bright and long lasting so they are a good choice for these places. Answer: gas
[EX A]: When electricity is passed through solid sodium it changes into what and gives off light?

[EX Q]: Passage: Jupiter has lots of moons. As of 2011, we have discovered over 60 natural satellites of Jupiter. Four are big enough and bright enough to be seen from Earth using a pair of binoculars. These four moons were first discovered by Galileo in 1610. They are called the Galilean moons . Figure below shows the four Galilean moons and their sizes relative to Jupiter's Great Red Spot. These moons are named Io, Europa, Ganymede, and Callisto. The Galilean moons are larger than even the biggest dwarf planets, Pluto and Eris. Ganymede is the biggest moon in the solar system. It is even larger than the planet Mercury!. Answer: galileo
[EX A]: Who first discovered the moons of jupiter in 1610?

[EX Q]: Passage: where k is a constant equal to Electric Potential. Answer: infrared
[EX A]:
What radiation, generally produced by thermal motion and the vibration and rotation of atoms and molecules, literally means "below red"?