In a two-slit interference pattern projected on a screen, are the fringes equally spaced on a screen everywhere only for large angles only for small angles

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Sound is a disturbance that travels through a medium as a

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