light travels approximately 300,000,000 metres each second. A light year is the total distance travelled by light in one year. Assuming there are 365 days in a year, determine a light year, expressing your answer in standard form and with the correct unit.

Answer: 9.45 x 10^15 m

Step-by-step explanation:

The speed of light = 300,000,000 m/s (3·00 * 10^8m/s).

Length of Earth year = 365 days

= 365 * 24 * 60 * 60 seconds = 3·15 * 10^7seconds

Now speed = distance / time ...

so ... distance = speed * time

So: 1 light year = 3·00 * 10^8 * 3·15 * 10^7

1 light year = 9·45 * 10^15 m

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

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