Multi. Choose... A. exposed to weak light.
B. cooled rapidly
C. Bombarded by high-speed electrons
D. subjected to a small voltage

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Think about everyday conductors. If you put a bare wire in sunlight, do you think anything happens where the electrons move?

When you are cooling hot iron from the iron extraction factory, does the iron emit more light? (the movement of electrons in atoms often causes light to be emitted)

High speed electrons could be beta radiations (there are three types of radiations, alpha, beta and gamma that radioactive materials emit). Here also, light can be emitted. Do you know how a television works? High speed electrons are bombarded on the screen rapidly from the top of the screen to the bottom of the screen sweeping the whole area in the process in less than a second.

How to light bulbs work? There is a conductor and it glows when current passes through it. So, what do you think?

It has to cool rapidly.