Question

A particular star is at a distance of about 8.1×10^13 km from the earth assuming that the light travels at 3×10^8 m/sec find how long does light takes from that star to reach the earth
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Answer 1

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Answer 2

$\huge{\mathfrak{Solution:-}}$

$\sf{Distance=8.1\times 10^{13}\;km}$

$\sf{\implies 8.1\times 10^{16}\;km}$

$\sf{Speed=3\times 10^{8}\;m/sec}$

$\sf{Time=\frac{distance}{speed}}$

$\sf{\implies \frac{8.1\times 10^{16}}{3\times 10^{8}}}$

$\boxed{\sf{\implies 2.7\times 10^{8}\;seconds}}$