a. is false, since cosmological redshift does not produce "peculiar motion" b. is false since it is not a cause, it is an observation that redshift is proportional to distance.
True.
c. is false because d. is true. d. the expansion of space .
T/F: Cosmological redshift causes a change in the spectrum of a galaxy similar to the change that Dopper shift causes in the spectrum of a star. For small velocities (much less than the speed of light), cosmological redshift is related to recession velocity ( v) through: where c the speed of light.
Cosmological redshift and Doppler shift are the same phenomenon-the shifting of wavelengths due to relative motion between the source and observer. The farther they are from us, the faster they move. "The cosmological redshift is caused by?"
So, cosmological redshift means that light stretches as space expands.
In fact, it stretches so much that by the time we get to some distant galaxies, their visible and ultraviolet light has shifted to the infrared spectrum. The longer the photon travels, the more space expands and the more the photon is redshifted during the time it is traveling
Caused solely by the expansion of the Universe, the value of the cosmological redshift indicates the recession velocity of the object, or its distance. The wavelength of photons from a distant galaxy becomes stretched by the expansion of space while the photons are traveling toward us. This redshift-distance law is caused by the expansion of space itself, which stretches the wavelength of the photon. In cosmological redshift, the shifting of frequencies is basically caused by the stretching of space the light is passing through, and the stretching of the light wave with it.
What causes the cosmological redshift of light?
In the widely accepted cosmological model based on general relativity, redshift is mainly a result of the expansion of space: this means that the farther away a galaxy is from us, the more the space has expanded in the time since the light left that galaxy, so the more the light has been stretched, the more redshifted the light is, and so the faster it appears to be moving away from us.
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