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  1. A star is 8.1 x 1013 km away from the earth.Suppose light travels at the speed of 3.0 x 105 km per second. How long will it take light from the star to reach the earth?
    2. A.
    7.5 x 103 hrs
    B.
    7.5 x 104 hrs
    C.
    2.7 x 1010 sec
    D.
    2.7 x 1011 sec

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    Workspace

    View Answer

    Answer : Option B

    Explanation :

    (3 x 105)km is covered in 1sec 


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