Which of the following is a true statement? A smaller diameter star can never have a smaller number for its apparent magnitude than a larger star. Two stars with the same diameter and effective surface temperature will necessarily have the same absolute magnitude as well. Aristotle was the first person to detect stellar parallax. All G2 stars necessarily have the same absolute magnitude.
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.
The statement that is true among the options provided is:
"A smaller diameter star can never have a smaller number for its apparent magnitude than a larger star."
This statement is generally true because apparent magnitude is a measure of how bright a star appears from Earth, and larger stars, which have more surface area to emit light, often appear brighter (smaller apparent magnitude) than smaller stars. However, there can be exceptions depending on factors like distance, temperature, and luminosity.
Step by step
Solved in 3 steps
