PrepTest 115, Section 3, Question 21
With the approach of the twentieth century, the(454 more words not shown)
The passage provides information that(7 more words not shown)
- AWhat did Planck's(8 more words not shown)
- BWhat led to(7 more words not shown)
- CRoughly when did(6 more words not shown)
- DWhat contributions did(6 more words not shown)
- EWhat type of(12 more words not shown)
Reading the passage
Keep the sequence straight: unexpected experimental results, Planck's proposed explanation, and later support from Einstein and others. Four questions have answers somewhere in that account. We're looking for the one whose answer we don't actually receive.
Working the answers
- A
Planck was trying to explain the observed blackbody radiation that didn't match wave theory's prediction. His new hypothesis produced numbers that fit those observations.
- B
Einstein and others supplied theoretical justification and supporting findings. That's the development that addresses the community's initial criticism.
- C
The experiments occurred around the transition between centuries (paragraph 2), with the opening identifying the approaching twentieth century. The question asks roughly when, so a precise year isn't necessary.
- DCorrect
We hear that Planck had made important contributions to classical wave theory, but never learn what they were. His later discrete-energy hypothesis isn't the missing answer: that proposal breaks with the classical assumption. The question asks about the earlier contributions mentioned when Planck is introduced.
- E
Do we get a type of experiment? Yes: radiation strikes metal surfaces, which give off energy at discontinuous values and stop emitting beyond a threshold. That is enough to answer the question. We don't need every detail of the procedure.
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