天文学 TPO3-L4 Spectroscopy

TPO3-L4

Spectroscopy

Listen to part of a lecture in an astronomy class.

 



  1. What is the lecture mainly about?
  • A. Different ways of magnifying the spectrum of a star.
  • B. How a chemical element was first discovered on the Sun.
  • C. How astronomers identify the chemical elements in a star.
  • D. Why the spectra of different stars are composed of different colors.

 

  1. What does the professor explain to one of the students about the term “radiation”?
  • A. It is defined incorrectly in the textbooks.
  • B. It was first used in the nineteenth century.
  • C. It is rarely used by astronomers.
  • D. It does not refer only to harmful energy.

 

  1. What can be inferred about two stars if their spectra have similar spectral line patterns?
  • A. The stars are approximately the same distance from the Earth.
  • B. The stars probably have some chemical elements in common.
  • C. The stars have nearly the same brightness.
  • D. The stars are probably of the same size.

 

  1. According to the professor, what is the purpose of heating an element in a spectroscopic flame test?
  • A. To cause an element to emit light.
  • B. To study an element in combination with other elements.
  • C. To remove impurities from the element.
  • D. To measure an element’s resistance to heat.

 

  1. Why does the professor say this: 🎧
  • A. He is about to provide some background information.
  • B. He is about to repeat what he just said.
  • C. He intends to focus on the history of astronomy.
  • D. He intends to explain two different points of view.

 

  1. Why does the professor ask this: 🎧
  • A. To check the students’ understanding of their reading assignment.
  • B. To give the students a hint to the answer to his previous question.
  • C. To emphasize how important it is for astronomers to study Greek.
  • D. To remind the students about the historical background of astronomy.


答案:
C D B A A B

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