Question

taking one light year equal to to the power 15 and Vande 6400 second Express the speed of light as light year per day​

Answer 1

Light Years

Let's work out how far a light year is.

The speed of light = 300,000,000 m/s (3·00 × 108 m/s).

Length of Earth year = 365 days = 365 × 24 hours = 365 × 24 × 60 minutes = 365 × 24 × 60 × 60 seconds = 3·15 × 107 seconds

Now speed = distance / time ... so ... distance = speed × time

So: 1 light year = 3·00 × 108 × 3·15 × 107

1 light year = 9·46 × 1015 m

That's nearly 9 1/2 million, million kilometres! Phew!!