Question

The nearest star to our solar system is $4.3$ light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun $= 1.5 \times 10^{11}\, m$ and one light year $= 9.46 \times 10^{15} \, m$ )

• A. $1.3$
• B. $8.0$
• C. $13.0$
• D. $3.3 \times 10^{4}$

Answer 1

Answer: (A)

$1.3$

Answer 2

Since, we know that
$1$ light year $= 9.46 \times 10^{15}\, m$
$\therefore 4.3$ light year $=4.3 \times 9.46\times 10^{15}\,m$
and $1$ parsec $=3.1\times 10^{16}\,m$
$\therefore 4.3$ light year $=\frac{4.3\times 9.46\times 10^{15}}{31\times 10^{16}}$ parsec
$=13.12\times10$
$=1.3$ parsec