Chapter 22, Problem 31A

Notice that a desk lamp often has small holes near the top of the metal lampshade. How do these holes keep the lamp cool?

To determine

To explain: The reason due which small holes near the top of the metal lampshade keeps a lamp cool.

Explanation of Solution

Introduction:

The process of heat transfer by the movement of heated particles is called convection.

The bulb gets hot due to the light. The holes near the top of the lampshade allow the heat from the lamp to escape. Hot air, being light, rises from the bulb. Cold air moves in through the holes to take the place of the hot air. This allows the lamp to cool down.

Conclusion:

The holes near the top of the lampshade allow convection, which keeps the lamp cool.