Why does sirius a appear so much fainter than the sun

Assignment Help Physics

Reference no: EM13810797

1. How much more energy per cm² per second would a 4000 K black body emit than a 2000 K black body?

2. Approximate how much more energy per cm² per second a blue star would emit more than a yellow star.

If we assume that stars are spherical, the total area of the star would be 4Πr², where R is the radius of the star and Π is delicious no just kidding Π x is 3.1416. Since Stephen's Law gives us the energy emitted by each square centimeter of the star per second, the total energy emitted by the entire star will be:

L = Wein's constant * 4ΠR²*T⁴ the units being energy per second. L is called the intrinsic luminosity. Notice that it depends on the radius of the star & the star's temperature.

3. A Star, Sirius A, has a temperature and radius twice that of our Sun. How much greater is the intrinsic luminosity of Sirius A as compared to our Sun? (Show your work!)

4. Why does Sirius A appear so much fainter than the Sun?

5. Sirius A has a companion star, Sirius B, which is also twice as hot as our Sun but which has an intrinsic luminosity only 0.0025 that of our Sun. What is the diameter of Sirius B compared to that of our Sun?

6. Another star, Betelgeuse, has a temperature only one-half as great as our Sun, but it is 10,000 times brighter. Explain why this star is so much brighter than our Sun.

Reference no: EM13810797

Questions Cloud

Assignment on constitutional and admin law : Constitutional and Admin Law

Critical success factors in particular : Consider your own health care organization or one which you would someday hope to lead. Based upon your learning in this course, state and explain at least three "critical success factors" for your organization, department or program. Why did you sel..

Find various life cycle models : In software engineering, one can find various life cycle models. Some examples include the waterfall model, agile processes, and iterative and incremental models. Research at least five (5) current and representative life cycle models

Determine the best way to estimate the value of time : Determine the best way to estimate the value of time

Why does sirius a appear so much fainter than the sun : How much greater is the intrinsic luminosity of Sirius A as compared to our Sun and Why does Sirius A appear so much fainter than the Sun

Elements of a contract that must exist : Describe and analyze the five elements of a contract that must exist for this agreement to be enforceable. Explain why this contract is governed by common law or the Uniform Commercial Code (UCC). Examine at least two circumstances in which this non-..

Define media influence with regard to politics and democracy : What specific roles do both media forums that you chose have in exposing the various aspects of a political process. Explain in detail. How persuasive are these media forums in terms of influencing the public about a politician or a campaign issue

Policy analysis and program evaluation : Policy Analysis and Program Evaluation

Program that calculate the average of a group of test scores : Write a program that calculate the average of a group of test scores, where the lowest score is dropped. It should use the following functions: void getScore() - should ask the user for a test score, store it in a reference parameter variable, and..

User Account

All Pages