A Galaxy Is Observed Receding from Earth with a Speed

question 9

Multiple Choice

A galaxy is observed receding from Earth with a speed of 9800 km/s. A redshifted spectral line originating in the galaxy is compared to the same spectral line originating in the laboratory. If Hubble's law is valid for this galaxy, what is the ratio of the wavelength of the redshifted line to that of the unshifted line if the Hubble constant is 22 km/s per million light-years? (c = 3.00 × 10⁸ m/s, 1 ly = 9.461 × 10¹⁵ m, 1 y = 3.156 × 10⁷ s)

• A) 1.033
• B) 1.052
• C) 1.072
• D) 1.091
• E) 1.130

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Definitions:

Handedness

The preference of using one hand over the other for performing tasks; this can be right-handedness, left-handedness, or ambidexterity.

Left-handed

A characteristic of individuals who primarily use their left hand for tasks such as writing and handling tools, often associated with differences in brain structure and function.

Schizophrenia

A severe psychological disorder that is characterized by disturbances in thought and language, perception and attention, motor activity, and mood, and by withdrawal and absorption into daydreams or fantasy.

Intelligence

A complex and controversial concept, defined by David Wechsler as “[the] capacity . . . to understand the world [and the] resourcefulness to cope with its challenges.” Intelligence implies the capacity to make adaptive choices (from the Latin inter, meaning “among,” and legere, meaning “to choose”).