a. how the information on a CD is read.
b. why semiconductor lasers were invented.
c. where information is stored on a CD.
d. what pits and bumps are.
e. the purpose of the aluminum layer of a CD.
Answers
1. c. The answer may be found in lines 4 and 5, which state that Russell wanted an alternative to his scratched and warped phonograph records. You may infer that the problem with such records was their poor sound quality.
2. e. Lines 2627 state that the detectors function is to convert data collected by the laser into music.
3. b. While the paragraph explains the function of semiconductor lasers in reading the information on CDs, it does not say anything about why they were invented.
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