A man’s eyes 2.5 m above sea level can barely see the top of a lighthouse which is at a certain distance away from the man What is the elevation of the top of the lighthouse in meters (m) above sea level if the lighthouse is 30 km away from the man? How far is the lighthouse from the man in meters (m) if the top of the lighthouse is 25 m above sea level?
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.
A man’s eyes 2.5 m above sea level can barely see the top of a lighthouse which is at a certain distance away from the man
- What is the elevation of the top of the lighthouse in meters (m) above sea level if the lighthouse is 30 km away from the man?
- How far is the lighthouse from the man in meters (m) if the top of the lighthouse is 25 m above sea level?
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