A-Level Physics - Year 1 (AS): What substance is inside a fluorescent tube, and what happens when a high voltage is applied?

Question

What substance is inside a fluorescent tube, and what happens when a high voltage is applied?

daavide · Accepted Answer

Mercury vapour is inside the tube, and the high voltage accelerates free electrons through it.

What substance is inside a fluorescent tube, and what happens when a high voltage is applied?