Question

if the velocity's of light is given to be 2.99×10^8m/s, calculate the distance travelled by light in 1 year and express it in scientific notation .this distance is known as 1 light year. please explain

Answer 1

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

⇒ Distance= Speed× Time

In this case, speed =2.99× 10^8 m/s

Time= 1 year= 365 days= 365× 86400 seconds

⇒ 31536000 seconds

∴DIstance= 2.99× 10^8× 31536000

⇒ 9.429264e+15 metres

This distance is known as 1 light year and is used very freqently in cosmology. This came in common because it make it a lot easier to measure distances as long as they are in the case of cosmology.

Answer 2

Answer:

Speed = \frac{Distance}{Time}

Time

Distance

⇒ Distance= Speed× Time

In this case, speed =2.99× 10^8 m/s

Time= 1 year= 365 days= 365× 86400 seconds

⇒ 31536000 seconds

∴DIstance= 2.99× 10^8× 31536000

⇒ 9.429264e+15 metres

This distance is known as 1 light year and is used very freqently in cosmology. This came in common because it make it a lot easier to measure distances as long as they are in the case of cosmology.