The quantum theory of radiation reflects: the principle of superposition
the electromagnetic theory of light
the special theory of relativity
the principle of the photoelectric effect ​

"why is graphite used instead of gold or copper wires to conduct electricity in very hot situations such as an industrial kiln? " that's the question, but the thing is, i don't even understand what an "industrial kiln" xd assistance would be < 3

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?