KVPY SA Exam 2018 Question Paper

Question : 25 of 80

Marks: +1, -0

Many exoplanets have been discovered by the transit method, wherein one monitors a dip in the intensity of the parent star as the exoplanet moves in front it. The exoplanet has a radius R and the parent star has radius 100R. If

I_0

is the intensity observed on earth due to the parent star, then as the exoplanet transits.

the minimum observed intensity of the parent star is 0.9 $I_0$
the minimum observed intensity of the parent star is 0.99 $I_0$
the minimum observed intensity of the parent star is 0.999 $I_0$
the minimum observed intensity of the parent star is 0.9999 $I_0$

Validate

Solution:

The minimum observed intensity of the parent star is 0.9999

I_0

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