?
@Vocaloid
well, I'm thinking the first blank is either electron, particle, or substance? it's a little vague from the context
i think its substance
hm. well I believe the second one might be energy or energy level? since the energy level transition determines the frequency
i have no idea what the third would be
yeah, I'm a little stumped too, I'm trying to think of like a one-word thing that would fill the blank "low frequency" is all I can think of, since classical predicts that any frequency could be used with enough intensity
anyway for the fourth blank, the conflict between classical predictions and experimental results is given a name called the Ultraviolet ________ any ideas what goes into the blank? starts with a c
ultraviolet ~catastrophe~ is the name I really don't know about the fifth blank... current? it's describing the flow of electrons
for the next blank (only light of a minimum _____) do you remember which property of light that determines electron ejection in quantum physics? I can give you three choices, wavelength, energy, and frequency
eneegy?
good guess but not quite, it's based on ~frequency~
any ideas for the next blank? starts with an s, looks like this: 
shines
good guess but we call this pattern of light a ~spectrum~ and for the last blank i'm not 100% sure but they might be looking for ~emission~?
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