Sunspots, flares, prominences, and coronal mass ejections are all caused by

Electrons have a negative charge if that's what you're asking

F= v/λ      velocity of light  c = 3.00 x 10⁸ m/sgiven: wavelength 12, mm    12 nm        5 nmthe answer is 12 nm wavelength  convert to meter  m= 1.2 x 10⁻⁸ mf = v/λf = 3.00 x 10⁸ m/s/ 1.2 x 10⁻⁸ mf = 2.5 x 10¹⁶ hz

D. to reassure the country of his credibility and emphasize the importance of standing united behind the government.