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?

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?