Solved Questions and Answers Only for Medical and Non Medical Students.

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Q1. How many par sec are there
in one light year ?

Solution. As is known, 1 ly =9.46 x 10¹⁵ m
and 1 par sec = 3.1 x 10¹⁶ m
1ly              =9.46x10¹⁵
.:------       ---------- =0.305
1par sec    3.1×10¹⁶

:.1 ly = 0.305 par sec.

Q2 The mass of a proton is 1.67
x 10‐²⁷kg. How many protons would make 1 gram?

Solution. Here, mp= 1.67 x 10‐²⁷kg;
total mass, m = 1 g = 10‐³ kg

:.Number of protons = m = 10‐³kg
                                   ---    ------------
                                  mp      1.67×10‐²⁷kg
                               = 5.99×10²³


Q3. Calculate the number of light
years in one kilometer.

Solution. As is known,
1 ly = 9.46 x 10¹⁵m
= 9.46 x 10¹²km
:.1km    =1          
           --------
         9.46x10¹²

1 km = 1.057 x 10¹³1y

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