When X-rays of wavelength 0.0630 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.8°. What is the distance (in pm) between the layers of atoms responsible for the diffraction?

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up