An object is observed to be moving at a velocity of X kilometers per second away from Earth. What is its redshift? [b] I
Posted: Wed May 04, 2022 1:37 pm
An object is observed to be moving at a velocity of X kilometers
per second away from Earth. What is its redshift?
Is this object's observed velocity likely to be due
primarily to cosmic expansion, or to gravitational acceleration, or
to neither? Explain your reasoning.
[c] Another object is measured to be at a distance of Y
Megaparsecs away from Earth. Using a currently accepted value of
the Hubble constant, calculate its expected velocity away from
Earth due to cosmic expansion. You may find a review of your notes
of Lectures 05 or 06 helpful.
[a] If you observe light from a distant object that was emitted
when the cosmic background temperature was Y Kelvin, that is the
redshift z of that light?
At that redshift, what was the diameter of the universe at
that time compared to the diameter of the universe today?
[c] If you observe an emission line in the spectrum of that
object at a wavelength of W nanometers, calculate the rest
wavelength of that emission line.
d. What is an advantage of calculating the passage of cosmic
time in units of redshift instead of using units of seconds? What
is a disadvantage?
per second away from Earth. What is its redshift?
Is this object's observed velocity likely to be due
primarily to cosmic expansion, or to gravitational acceleration, or
to neither? Explain your reasoning.
[c] Another object is measured to be at a distance of Y
Megaparsecs away from Earth. Using a currently accepted value of
the Hubble constant, calculate its expected velocity away from
Earth due to cosmic expansion. You may find a review of your notes
of Lectures 05 or 06 helpful.
[a] If you observe light from a distant object that was emitted
when the cosmic background temperature was Y Kelvin, that is the
redshift z of that light?
At that redshift, what was the diameter of the universe at
that time compared to the diameter of the universe today?
[c] If you observe an emission line in the spectrum of that
object at a wavelength of W nanometers, calculate the rest
wavelength of that emission line.
d. What is an advantage of calculating the passage of cosmic
time in units of redshift instead of using units of seconds? What
is a disadvantage?