Answered: Given the Sun's present rate of energy…

Given the Sun's present rate of energy generation (i.e. its present luminosity), how long will the Sun's energy source last (from beginning to end)? Answer in years

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter6: Photons And Matter Waves

Section: Chapter Questions

Problem 130AP: In about 5 billion years, the sun will evolve to a red giant. Assume that its surface temperature...

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Concept explainers

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.

Question

Given the Sun's present rate of energy generation (i.e. its present luminosity), how long will the Sun's energy source last (from beginning to end)? Answer in years

Hint: This is a gas can problem. The Luminosity of the Sun is 3.83e+26 W

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