Chapter 11, Problem 22R

To determine

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

Answer to Problem 22R

The correct word is ultraviolet waves.

Explanation of Solution

Introduction:

A repeating movement 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.

UV wave is an electromagnetic wave. Wavelength of UV wave is between four hundred billionths (meter around) and 10 billionths (meter around). So, ultraviolet waves may cause sun burn but some exposure to UV waves is healthy.

Conclusion:

UV waves are harmful and useful both for the human body.