Option (d) is correct. The absolute magnitude of the Rigel is more than that of Sirius but it does not appear more bright in night sky.
Explanation:
The absolute magnitude of a star is defined as the magnitude of the brightness of the star. It depends on the total amount of the light emitted by the particular star.
The brightness of the star is measured in terms of two quantities. The absolute magnitude and the apparent magnitude of the star. The apparent magnitude of the star is the brightness observer by the observer which is present at a particular distance from the observer.
The distance of the star Sirius from the surface of the Earth is about [tex]8\text{ light years}[/tex] whereas the distance of the star Rigel from the surface of the Earth is about [tex]850\text{ light years}[/tex].
The huge distance of the Rigel from the Earth makes it less brighter than the Sirius in the night sky in spite of having greater absolute magnitude. It is because the apparent magnitude of the star as observed on the Earth is greater for the star Sirius due to its smaller distance as compared to the Rigel.
Thus, Option (d) is correct. The absolute magnitude of the Rigel is more than that of Sirius but it does not appear more bright in night sky.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Astronomy
Keywords:
apparent, absolute, magnitude, star, observer, brightness, Sirius, Rigel, parallax, bright, light year, distance.
