Question

Let's assume you made a spaceship which can travel with a speed of 50,000 km/seconds.Now you want to go to our nearest star Alpha Centauri which is 4 light years away. Considering that the speed of light is equal to 3,00,000 km/second, if you start your journey today, in how many years will you reach Alpha Centauri?

• A. 20 years
• B. 30 years
• C. 24 years
• D. 16 years

Answer 1

The correct option is C 24 years

Time $=\frac{Distance}{speed}$
Total time taken by light to reach Alpha Centuari = 4 years
Number of times the speed of light is greater than the speed of the spaceship $=\frac{3,00,000}{50,000}$= 6 times
Time taken by spaceship = $6\times 4$= 24 years