Consider electrons flowing in copper. a) Compute the average time between collisions for free electrons in copper. (Hint: The density of free electrons in copper is 8.44 x 1028 electrons / m3). b) Due to quantum mechanical effects, electrons in copper have a speed of about 106 m/s at room temperature. Show that electrons moving at such speeds will travel an average distance of 25 nanometers between collisions.

Consider electrons flowing in copper. a) Compute the average time between collisions for free electrons in copper. (Hint: The density of free electrons in copper is 8.44 x 1028 electrons / m3). b) Due to quantum mechanical effects, electrons in copper have a speed of about 106 m/s at room temperature. Show that electrons moving at such speeds will travel an average distance of 25 nanometers between collisions.