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Question

Find the order of magnitude of the mass of the star, whose radius is 384×106 m and average density is 4×103 kg m3 :

A
30
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B
29
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C
24
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D
21
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Solution

The correct option is A 30
Radius of star r=384×106m
So, Volume of star is V=4πr3/3=2.371×1026m3
Density of star is ρ=4×103kgm3
Mass of star is M=V×ρ9.5×1029kg=0.95×1030kg
So the mass is of order of 1030kg

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