Which of the following devices is most likely to contain an electromagnetic?

The two required components for a generator are

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Often called simply "velocity," this is the velocity of an object at a particular moment in time.