An experiment measures the growth of crystals in a liquid solution aboard the space shuttle. a collection of bottles has the liquid in varying strength, or concentration of the tested substance. what would be a control observation in this experiment? a. the bottle with 0% concentration b. the bottle with the weakest concentration c. the bottle with the strongest concentration d. the bottle with the medium amount of concentration

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction