light of wavelength 575 nm passes through a double slit and the third order bright fringe is seen at an angle of 6.5 away from the central fringe. what is the separation between the double slits

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

How have the competing explanations' experiments on atoms affected the development of the atomic model?

What’s #16 asking me and how do i solve it?