The diagram below shows two paths that incoming white light might follow when striking the surface of water with a thin
film of soap over it. Which of the following must be true
concerning the distance traveled by red light within the soap film
so that upon emerging along path B it destructively interferes
with red light that reflected off the soap along path A?
a) The distance travelled within the soap = 1 wavelength of red light
b) The distance travelled within the soap = 1/2 wavelength of red light
c) The distance travelled within the soap = 2 wavelength of red light
d) The distance travelled within the soap = 2 wavelength of blue light

How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?