Question

The average distance between Earth and the Sun is $1.496\times {10}^{8}km$ and the speed of light coming from the Sun is $3\times {10}^{8}m/s$. How much time will it take for Sun's rays to reach Earth?

• A. $3min$
• B. $498.66s$
• C. $8min$ $30s$
• D. $554s$

Answer 1

Answer: (B)

$498.66s$

Distance between Earth and Sun$=1.496\times {10}^{8}km=1.496\times {10}^{11}m$
Speed of light $=3\times {10}^{8}m/s$
By using the formula:
$speed=\frac{Distance}{Time}$
or $3\times {10}^{8}m/s=\frac{1.496\times {10}^{11}m}{Time}$
So, $Time=\frac{1.496\times {10}^{11}m}{3\times {10}^{8}m/s}$ = $\frac{1496}{3}s$ $=498.66s$