Q. Light takes $8\min{20\ s}$ to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time${\ (}_{a}\mu_{\omega} = 4/3)$
A) 8 $\min{20\ s}$
B) $8\ min$
C) 6 $\min{11\ s}$
D) 11 $\min{6\ s}$
Explanation
(d) $\mu = \frac{c_{a}}{c_{w}} = \frac{t_{w}}{t_{a}} \Rightarrow t_{w} = \frac{25}{3} \times \frac{4}{3} = 11\frac{1}{9} = 11\min{6\ s}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.