verb forms v1v2v3

Statement 1: Any charge will move from electric potential v_(1) and V_(2) by its own only when v_(1) lt V_(2) Statement2: Electron moves form V_(1)=2V towards V_(2)=4V

The 3-dimensional vectors v_1, v_2, v_3 satisfying v_1cdotv_1=4, v_1cdotv_2=-2, v_1cdotv_3=6, v_2cdotv_2=2, v_2cdotv_3=-5, v_3cdotv_3=29 , then v_3 may be

Find 3 -dimensional vectors vec v_ (1), vec v_ (2), vec v_ (3) satisfying vec v_ (1) * vec v_ (1) = 4, vec v_ (1) * vec v_ (2) = - 2, vec v_ (1) * vec v_ (3) = 6, vec v_ (2) * vec v_ (2) = 2, vec v_ (2) * vec v_ (3) = - 5, vec v_ (3) * vec v_ (3)

The variation of photocurrent with collector potential for different frequencies of incident radiation v_1,v_2,v_3 is as shown in the the graph , then

If 1/(1+l)=v , prove that v+v^(2)+v^(3)+………+v^(n)=(1-v^(n))/l