The angular resolution of the largest single-dish radio telescope in the United States, the 100 m Green Bank Telescope, is closest to when it operates at a wavelength of 20 cm.

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.