Two astronauts are floating in outer space. They’re radios are broken. Explain why they would need to communicate using sign language instead of speaking to each other.

2) A non-magnetic conductor has a plasma frequency of 1eV and a damping frequency of 0.01eV. What values of relative real and imaginary permittivity are predicted by the Drude model at a frequency of 0.2eV?

6. The response of a band rejected filter is characterized in — — — — — A A ¢ ) 0 B 2 i i it

Voltage = 0, Intensity = 100%                 Currents for different metals          Wavelength nm Calculated frequency from wavelength x 1014 Hz Sodium   Zinc Copper Platinum 500   6x10^14   0 0 0 0 400   7.5x10^14 0.141 0 0 0 300   10x10^14 0.549 0 0 0 250   12x10^14 0.964  0.057 0 0 200   15x10^14 1.695   0.409   0.257  0 150   20x10^14 xxxxx xxxxx   1.077   0.336   Which metal has the most strongly bound electrons?   Which metal has the most weakly bound electrons?