Which best describes an example of an n-type semiconductor? It uses phosphorus so that electrical conduction is due to the movement of electrons.
It uses phosphorus so that electrical conduction is due to the movement of a positive charge.
It uses gallium so that electrical conduction is due to the movement of electrons.
It uses gallium so that electrical conduction is due to the movement of a positive charge.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

What is the measurement of how fast an object moves relative to a reference point?

You throw a baseball directly upward at time =0 at an initial speed of 14.9 m/s. what is the maximum height the ball reaches above where it leaves your hand? ignore air resistance and take =9.80 m/s2.