An electric iron has a rating 750 w,220v. calculate i) the current passing through it ii) its resistance when in use

This is the number of complete movements of a wave per second.

Two waves maximally constructively interfere at a point in space. among the options below, select the possible value of their phase difference at that point in space. a. zerob. πc. π/2d. not determinable by the information provided

Which if the following types of research is conducted on multiple occasions over time