As recently as the late 1970s, some wrist watches were manufactured using tritium (3H) as a continuous source of energy to make the watch face luminous in the dark. If you had purchased such a watch 36 years ago, what percentage of the luminosity would remain today, based on the half-life of tritium (4500 days)? Include 3 significant figures
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.
As recently as the late 1970s, some wrist watches were manufactured using tritium (3H) as a continuous source of energy to make the watch face luminous in the dark. If you had purchased such a watch 36 years ago, what percentage of the luminosity would remain today, based on the half-life of tritium (4500 days)?
Include 3 significant figures
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