Discover the Correct Star Radius with These Key Answers | Choose Wisely!

[wanwa]

Homework Statement

A star shows periodic brightness variations indicating a transiting pair of stars. If the minimum stellar flux is 98.2 percent of the uncapped flux, what is the radius of the other star in that pair, in terms of stellar radius, assuming the other star does not radiate?

Relevant Equations

I have no idea which equations should be used, star Flux is = L / (4πR^2).

Thank you in advance for anyone trying to solve this question. If something odd/wrong with the question let me know (because the original question is on another language).

I have the key answer for this (choosing 1 answer)

A. 0,018

B. 1,134

C. 0,278

D. 0,974

E. 0,982

 

[Drakkith]

Please show some sort of effort. If you don't know where to start, try explaining what you do understand about the problem and any thoughts you might have on how to solve it.

 

[haruspex]

star Flux is = L / (4πR^2).

Are you sure? According to https://en.wikipedia.org/wiki/Radiant_flux, it is the total power, not power per unit area. (And what is L?)

 

[Bandersnatch]

Are you sure? According to https://en.wikipedia.org/wiki/Radiant_flux, it is the total power, not power per unit area. (And what is L?)

The equation is fine. However, it's not really relevant here. There's very little maths needed.

The poster is new to the site, so it bears explaining that the response in post #2 was not being cheeky. That's a moderator enforcing forum guidelines on homework help: We don't spell out answers, but we can guide you to them (this is the Way ;) ).

@wanwa just describe what you think an observer would see when looking at the occultation. Or which part of the larger star is giving out light during the event. Think in terms of areas.

Also, ar the risk of potentially giving out the answer, the answer key either contains a mistake or is mistyped in the OP.