The difference between stage 3 and stage 4 sleep is that during stage sleep, waves occur more than 50 percent of the time. a. 3 . . delta b. 4 . . delta c. 3 . . alpha d. 4 . . alpha

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects