Question

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Answer the following questions based on stars and light years:
a) A star is 10 light years away from Earth. Suppose it dies on a certain day after an
explosion, after how much time will we see the explosion from Earth? Give reasons
for your answer.
b) A star is 12 light minutes from a planet. If the speed of light is 3,00,000 km/s, what is
the distance of the star from the planet in km?​​​​​

Answer 1

Answer:

(a) 100 years.

(b) 216000000 km.

Explanation:

(a) light travels at 1 lightyear per year so it will be visible after 100 years.

(b) 1 min= 60sec

12min=12 x 60 = 720s

time (t) = 720s

speed(v) = 3,00,000 kmph

distance(s)= speed(v) x time(t)

=3,00,000 x 720

= 216000000 km.

Answer 2

Answer:

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