Return to the Chapter-Opening Question, page 812, and answer it again now.
Try to explain why you may have answered differently the first lime.
CHAPTER-OPENING QUESTION—Guess now!
Which of the following best describes the difference between radio waves and X-rays?
(a) X-rays are
(b) Both can be thought of as electromagnetic waves. They differ only in wavelength and frequency.
(c) X-rays are pure energy. Radio waves are made of fields, not energy.
(d) Radio waves come from
(e) The fact that X-rays can expose film, and radio waves cannot, means they are fundamentally different.
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