PrepTest 115, Section 3, Question 18
With the approach of the twentieth century, the(454 more words not shown)
Which one of the following(14 more words not shown)
- Aradio(1 more words not shown)
- Bblack velvet or(1 more words not shown)
- Cmicroscopic(1 more words not shown)
- Dmetal(1 more words not shown)
- Eradio volume(1 more words not shown)
Reading the passage
Remember the volume dials? One can stop anywhere along a smooth range. The other clicks between set positions. That's how the writer makes continuous versus discrete energies concrete.
Working the answers
- A
Radio waves are part of the spectrum being discussed, not the illustration of the difference between energy values.
- B
Black velvet and soot are low-reflectivity materials used in the experiments. They illustrate a different point.
- C
Particles belong to the later explanation of radiation, not this comparison.
- D
Metal surfaces are used in the experiments described at the end.
- ECorrect
One dial “adjusts smoothly to any setting”; the other “clicks” between settings. The familiar difference illustrates any value along a range versus particular, separate values.
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