Question

question 19 of 25
how do home computer scanners use electromagnetic waves?
a. the waves are absorbed by objects, making them warmer.
b. the waves are absorbed or reflected to capture images or information.
c. the waves make objects brighter, making them easier to see.
d. the scanners change information received into modified radio waves.

Explanation:

Home computer scanners use light (which is an electromagnetic wave). Different parts of the object being scanned absorb or reflect the light differently. The scanner detects these differences (absorption or reflection patterns) to capture images or information. Option A is about heating (not relevant to scanning for images/info). Option C is too vague and not the core mechanism. Option D is incorrect as scanners don't change info into radio - waves in the way described.

Answer:

B. The waves are absorbed or reflected to capture images or information.