Redshift is observed when:(1 point)
Responses
A. a luminous object is stationary relative to an observer.
B. a distant luminous object travels rapidly towards an observer.
C. a distant luminous object travels rapidly away from an observer.
D. a luminous object is traveling alongside an observer.
C. a distant luminous object travels rapidly away from an observer.
Which correctly relate dark matter and dark energy to the Big Bang theory? Select the two correct answers.(1 point)
Responses
A. Without dark energy, structures in the early universe would never have developed.
B.Dark energy is the source of 25 percent of the mass of the universe.
C.Because of dark matter, gravitational interactions cause galaxies to develop.
D.Through dark energy, the universe is expanding at a faster and faster rate.
Which correctly relate dark matter and dark energy to the Big Bang theory? Select the two correct answers.(1 point)
A. Without dark energy, structures in the early universe would never have developed.
B.Dark energy is the source of 25 percent of the mass of the universe.
C.Because of dark matter, gravitational interactions cause galaxies to develop.
D.Through dark energy, the universe is expanding at a faster and faster rate.
The correct answer is C. Redshift is observed when a distant luminous object travels rapidly away from an observer. To understand why this occurs, we need to understand the concept of Doppler shift.
Doppler shift is the change in frequency or wavelength of a wave as observed by an observer moving relative to the source of the wave. When an object is moving away from an observer, the wavelengths of the light waves it emits get stretched, resulting in an increase in wavelength. This increase in wavelength corresponds to a decrease in frequency, causing the light to shift towards the red end of the spectrum. Hence, this phenomenon is known as redshift.
To determine the answer to this question, we need to consider how the observed light from a distant luminous object changes relative to the observer. When the distant object is traveling rapidly away from the observer, the light it emits is stretched, resulting in a redshift. Therefore, the correct option is C.