The mean time between collisions for electrons in a gold wire is 25 fs, where how many times does the electron collide with an ion while moving this distance?
a) (8 × 10¹⁵) times
b) (1.6 × 10¹⁶) times
c) (4 × 10¹⁴) times
d) (6.4 × 10¹⁶) times