Respostas

2013-12-01T17:54:28-02:00
a)
n = c/v    
n = 3 x 10^8/1,5 x 10^8
n = 2

b) 
n = c/v
v = 300 000 km/s/2,5
v = 120 000 km/s
5 3 5