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what do you guys mean by oscillators?

i don't really get why the graph of the intensity vs wavelength graph for black body radiation graph goes up then goes down. and how did hertz show that light is polarised? thanks guys.

i never really understood the concept of voltage so i thought i should ask now before its too late. my teacher always said its a potential difference, but other times she say that it is the push behind the current. so im a bit confused, what the hell is voltage... also, when power is being...

we have to build a dc motor and the practical bit is all done. i want to know what's in a design brief (part of the marking criteria said design brief shows commutator etc with clear diagram) and the last part of the question asked us to research physics research leading to 3 future directions...