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Zorluk: OrtaPrimary Purpose of the Whole Text

In 1967, astronomer Jocelyn Bell Burnell detected a series of highly regular radio pulses while analyzing data from a newly constructed radio telescope. Initially, some researchers speculated that these rapid, precise signals might be transmissions from extraterrestrial civilizations, jokingly referencing the source as 'LGM-1' (Little Green Men). However, Burnell and her advisor, Antony Hewish, soon identified several other sources emitting similar periodic signals from vastly different regions of the sky. This discovery of multiple, dispersed sources rendered the artificial transmission hypothesis highly improbable, as it would require multiple civilizations to broadcast identical signals simultaneously. Consequently, the scientific community accepted that these pulses originated from a natural, previously unobserved astronomical phenomenon, later identified as rapidly rotating neutron stars, or pulsars.

Which choice best states the main purpose of the text?

  1. A
    To highlight the design and development of the new radio telescope that detected the first pulsar.
  2. To describe how the discovery of multiple periodic radio signals led researchers to reject an artificial origin in favor of a natural explanation.Cevap
  3. C
    To explain why early researchers believed that extraterrestrial civilizations were broadcasting regular radio signals.
  4. D
    To argue that rapidly rotating neutron stars are the primary source of all electromagnetic radiation in the galaxy.

Cevap

To describe how the discovery of multiple periodic radio signals led researchers to reject an artificial origin in favor of a natural explanation.
The correct option best describes the primary purpose of the text because it summarizes the progression of the passage: the text begins with the discovery of regular radio signals, explains why the hypothesis of artificial extraterrestrial origin was discarded when multiple sources were found, and concludes with the acceptance of a natural explanation.

Adım Adım Çözüm

1
Identify the initial observation and the hypothesis raised by researchers.
The detection of highly regular radio signals led to speculation that they might be extraterrestrial transmissions.
This establishes the starting point of the scientific investigation described in the text.
2
Analyze how new evidence challenged this initial hypothesis.
The discovery of multiple other sources emitting similar signals from different regions of the sky made the extraterrestrial hypothesis highly improbable.
This details the turning point in the passage, where the artificial origin theory is systematically undermined by observational data.
3
Determine the final conclusion reached by the scientific community.
The signals were accepted as a natural astronomical phenomenon, specifically rapidly rotating neutron stars (pulsars).
This represents the final resolution and the overall point toward which the entire narrative builds.

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Primary Purpose of the Whole Text
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