menu 8 Milky Way and Other Galaxies
Erasmus+: Key action 2:Strategic Partnerships in School Education

Practical Exercise 3:

How long does it take to the light beam to travel from the east of the Slovak Republic to the west?

Answer: We mark the given parameters = 490 km, c = 300 000 km/s. For the time t we get: t = d/c = 490/300 000 s ≐ 0,0016 s.

We can try the estimation – if the round the distance to 500 km, we get 5/3 0.001 s, what, after rounding up, matches on the order of the calculated number.

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