Chapter 11, Problem 21R

To determine

To fill: The appropriate word in the given blank space.

Answer to Problem 21R

The correct word is infrared waves.

Explanation of Solution

Introduction:

A repeating movement (or disturbance) that transfers energy through space or matter is known as wave. A wave consists of magnetic fields and oscillating electric that mutually induce each other, called electromagnetic waves.

Infrared waves are electromagnetic waves. Wavelength of infrared wave is between about one-thousand (meter) to seven hundred billionths (meter). Every object emits infrared waves. Devices that use infrared waves are television remote controls, CD-ROM drives etc.

Conclusion:

The correct answer is infrared waves.