
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
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.
Chapter 11 Solutions
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