Fi say that an electron is a spin-1/2 particle, which of the following statement(s) is/are true?
a) the magnitude of the spin vector is 1/2
b) the magnitude of the spin vector is hbar/2
c) the magnitude of the spin vector along some axis is 1/2
d) the magnitude of the spin vector along some axis is hbar/2

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.