Question

4. If the velocity of light is 3.0 x 10 metres per second, calculate the distance travelled by
light in a light year and express it in standard form.
[Hint: One light year = Distance travelled by light in a year.]​

Answer 1

Answer - Seconds in 24 hours (1day) = 86400sec.

Seconds in a year (365days) - 86400×365

=1,32,86,000 sec.

Velocity of light - 3.0 x 10 metres per second

= 30m

light travelled in a year = 1,32,86,000×30m

= 39,85,80,000m

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