Question

If the distance between the Sun and the Earth is $1.5\times {10}^{11}m$ and velocity of light is $3\times$ ${10}^{8}m/s$, then the time taken by a light ray to reach the Earth from the Sun is :

• A. $500seconds$
• B. $500minutes$
• C. $50seconds$
• D. $5\times {10}^{3}seconds$

Answer 1

Answer: (A)

$500seconds$

$Speed=\frac{Distance}{Time}$

$Time=\frac{Distance}{Speed}=\frac{1.5\times {10}^{11}}{3\times {10}^8}=500seconds$