Question

Rohan wants to know how far earth is from the sun. His friend says, 'sunlight takes 8.3 minutes to reach the earth'. How will Rahul solve this problem.

Answer 1

Dear Student,

$$\begin{gathered} \mathrm{speed}\mathrm{of}\mathrm{light},\mathrm{v}=3\times {10}^8\mathrm{m}/\mathrm{s} \\ \mathrm{time},\mathrm{t}=8.3\min \\ \mathrm{or},\mathrm{t}=8.3\times 60\mathrm{s}=498\mathrm{s} \\ \mathrm{distance}\mathrm{of}\mathrm{earth}\mathrm{from}\mathrm{sun},\mathrm{d}=\mathrm{v}\times \mathrm{t} \\ \mathrm{d}=3\times {10}^8\times 498=1494\times {10}^8\mathrm{m} \end{gathered}$$