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MMLU-Pro / 9173 / The hydrogen lines observed in the spectrum of the quasar 3C9 are shifted so far…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

The hydrogen lines observed in the spectrum of the quasar 3C9 are shifted so far into the red that their wavelengths are three times as long as those observed in the light from hydrogen atoms at rest in a laboratory on Earth. If it is assumed that the shift is entirely due to the relative motion of 3C9 and Earth, the relative speed of the quasar is

category

physics

options

  1. 0.6c
  2. c
  3. 0.8c
  4. 1.5c
  5. 2c
  6. 1.2c
  7. 0.5c
  8. 0.3c
  9. 0.9c
  10. 0.7c

src

ori_mmlu-college_physics

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Official source

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