What causes an aurora?
O A. An aurora is the consequence of solar wind entering the Earth and cutting through the Earth's magnetosphere.
OB. An aurora is the consequence of combustion of gases taking place at the poles of the Earth.
Oc. An aurora is the consequence of solar prominences entering the Earth.
OD. An aurora is the consequence of Sunspots entering the Earth.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct