Consider the refractive index of free electrons in copper, at frequencies around the plasma frequency, ωp in the Drude model. Write expressions for the reflectivity R at normal incidence as a function of frequency  in the vicinity of ωp. For copper the free electron relaxation time is 1.9 x10-14 s and the plasma energy is 7.8 eV.

The expression is given in the pictures below

Explanation:

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.