Question

Please can anyone answer it........ Please........

Answer 1

Answer:

27×10^4 seconds

Step-by-step explanation:

Let the time taken be y

So in time y the light travels

y×speed of light=distance of star from earth

So y=distance/speed of light

So y= (8.1×10^13)/(3×10^8)

y=27×10^4

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Answer 2

Answer: 2.7 × 10^8seconds or 4.5 ×10^6 hours

Step-by-step explanation:

We know that speed =distance /time

So if we transpose time to other side we see time = distance/ speed

Distance given = 8.1 × 10 ^13 km

Speed = 3× 10^8 m/s

As the distance is in ka we will convert it to meters

So distance = 8.1 × 10^13 × 10^3 => 8.1 × 10^16

Now when we divide the distance by speed we have

8.1 × 10^16 / 3 × 10^8

=> 8.1 × 10^16-8 / 3

=> 8.1 × 10^8 / 3

=> 810000000/3

=> 270000000 seconds

=> 2.7 × 10^8 seconds or 4.5 × 10^6 hours

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