Question

A particular star is at a distance of about 8.1×10^13 km from the Earth. Assuring that light travels at 3×10^8 m per second, find how long does light take from that star to reach the Earth? Express your answer in minutes.

Answer 1

Answer:

$\frac{8.1 \times {10}^{13} } {3 \times {10}^{8} }$

$\frac{81 \times {10}^{12} }{3 \times {10}^{8} }$

$\frac{81 \times {10}^{4} }{3}$

27×10⁴

$2.7 \times {10}^{5}$