Niels Bohr’s theory was based on evidence from a beam of particles that scattered after hitting thin gold foil. evidence that an atom will actually emit colors when heated. the experimental results of other scientists. the effect of holding a magnet next to a beam of electrons. A B C D i dont know

Consider the following problem: a box with an open top is to be constructed from a square piece of cardboard, 3 ft wide, by cutting out a square from each of the four corners and bending up the sides. find the largest volume that such a box can have.

The consumption of fossil fuels could be

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?