19

In a typical conventionally insulated house, heat is lost mainly through cracks in _______, windows, and doors.

20

From an atomic level, it is the _______ energy of the particles in the material that tells us the temperature of the material.

21

The warming of the earth by the sun is an example of heat transfer by the process of _________.

22

When two objects are in physical contact, heat can be transferred between the objects through the process of _______ .

23

A conventional 50W lightbulb that produces about 35W of heat, 5W of infrared light, and 10W of visible light is ____ percent efficient.

24

Auroras occur high above the earth in the ___________.