Some of the familiar hydrogen lines appear in the spectrum of quasar 3C9, but they are shifted so far toward the red that their wavelengths are observed to be 3.0 times as long as those observed for hydrogen atoms at rest in the laboratory. (a) Show that the classical Doppler equation gives a relative velocity of recession greater than c for this situation. (b) Assuming that the relative motion of 3C9 and Earth is due entirely to the cosmological expansion of the universe, find the recession speed that is predicted by the relativistic Doppler equation.
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
Some of the familiar hydrogen lines appear in the spectrum
of quasar 3C9, but they are shifted so far toward the red that their
wavelengths are observed to be 3.0 times as long as those observed
for hydrogen atoms at rest in the laboratory. (a) Show that the classical
Doppler equation gives a relative velocity of recession greater
than c for this situation. (b) Assuming that the relative motion of
3C9 and Earth is due entirely to the cosmological expansion of the
universe, find the recession speed that is predicted by the relativistic
Doppler equation.
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