Consider a metal wave guide with a rectangular cross section (10.0 cm x 20.0 cm). (a) if you want to propagate electromagnetic waves with a frequency of 2000mhz on this wave guide, what are the te and te modes? (b) what frequency range? will the electromagnetic wave only have one te mode?

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.

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

Which accounts for an increase in the temperature of a gas that is kept a constant volume