sophiecentaur said:
It needs to have a low work function but you won't be able to get hold of one of the Alkali Metals (with work functions corresponding to optical frequencies). It's the poor man's option (in a higher group), which just manages to produce photoelectrons with UV. I don't know whether anything else will do, to be honest, but it will have to obtainable and in the right group.EM_Guy said:
UV is absorbed by many glasses so it may be hard to do what you want with the low intensity available from Sunlight. Perhaps, if you went up a mountain??EM_Guy said:
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