Question. Which of the following is correct? 

(a) 2 parsec = 6.36 light year 
(b) 3 light year = I .89 x 105 astronomical unit 
(c) 4 fermi = 2 x 10-13 cm 
(d) 1 nanometre = 10-10

Dear Student ,
1 parsec=3.26156 light year3 light year = 1·89×105 astronomical unit4 fermi = 4×10-13cm1 nanometre=10-9 mSo here only second one is the correctly given .So second option is the correct option .Regards

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