Which statement does not describe redshift?
All the light emitted from all distant galaxies is at the red end of the spectrum.
The light arriving at the Earth from a receding star is always redshifted.
During redshift, the wavelength of the observed light is longer than it is if the redshift had not occurred.
The light from stars in all distant galaxies is moved towards the red end of the spectrum.
A
An astronomer observes a distant galaxy.
The table shows how the distance and the speed of recession of the galaxy are determined.
Which row is correct?
distance
speed of recession
brightness of a
supernova in the galaxy
change in wavelength of
starlight from the galaxy
brightness of a
supernova in the galaxy
brightness of
the galaxy
brightness of
the galaxy
change in wavelength of
starlight from the galaxy
brightness of
the galaxy
brightness of
a supernova
A
Which quantity can be determined using the brightness of a supernova in a distant galaxy?
the speed at which the galaxy is moving away from the Earth
the distance of the galaxy from the Earth
the Hubble constant
the age of the Universe
B