객관식The earth's circumference is approximately 40.1 Mm (megameters). What is this circumference in kilometers?8views
객관식Astronomers often detect radio waves with wavelengths of 3,000,000,000nm3,000,000,000\(\operatorname{\mathrm{n}\]\mathrm{m}\)}. What is this wavelength expressed in decameters (dam)?7views