The disturbance that occurs as longitudional waves travel through a medium can be described as a series of   oscillations and refractions.   destructions and constructions.   propagations and compressions.  rarefactions and compressions.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?