In air at 20 , sound travels at a constant speed of 344 . The light speed is equal to 299792458 . The light year is defined as the distance light travels in 1 year. Use this information to determine how many meters there are in 1 light year.
Also, How many meters does light travel in 1 nanosecond?

Question

In air at 20 , sound travels at a constant speed of 344 . The light speed is equal to 299792458 . The light year is defined as the distance light travels in 1 year. Use this information to determine how many meters there are in 1 light year.
Also, How many meters does light travel in 1 nanosecond?

3psilon · Answer

Use dimensional analysis 
We'll call the speed of light $$3x10^{8}$$ so.$$\frac{ 3x10^{8}meters }{ 1 \sec }*\frac{ 60 \sec }{ 1 \min} *\frac{ 60 \min }{ 1 hr }*\frac{ 24 hrs }{ 1 day }$$

3psilon · Answer

Every thing should cancel out but meters and days. Then just multiply by 365 days to get how many meters it travels in a year

anonymous · Answer

Thanks the answer is 9.46 x 10^15 m

3psilon · Answer

np :)

anonymous · Answer

Do you know How many meters does light travel in 1 nanosecond?