The diagram depicts four rods, and each one is made from a different metal. Small metal balls are fixed to the rod ends P, Q, R and S using wax. Every rod has the same dimensions. They are heated evenly by a Bunsen burner at point X. As the rods become hotter, the wax melts and the balls drop off. Why does the ball on the silver rod drop off first?
- ASilver is the best conductor of heat.
- BSilver is the worst conductor of heat.
- CSilver is the best radiator of heat.
- DSilver is the worst radiator of heat.