Question

How can you show that 1 light year is equal to 9.46*10 12km?

Answer 1

As,

1 light year is the distance travelled by light in 1 year

Speed of light =3*10^5 kmps

time in one year in seconds=1yr=365days=365*24 hours=365*24*3600 seconds

distance=speed*time=3*10^5*365*24*3600km=9.46*10^12km