Question 1
Which one of the following is a metallic conductor at room temperature but a superconductor at 18 K?
◦ graphite
◦ potassium fulleride
◦ diamond
◦ fullerene
Question 2
A particular superconductor has eight copper atoms on corners and eight copper atoms on edges of its unit cell. How many copper atoms are attributed to a single unit cell of this superconductor?
◦ 1
◦ 16
◦ 5
◦ 3