Explain radioactive element q which has a half life

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Problem- When Mr.Spock left Vulcan, he had a 50.00g sample of radioactive element Q which has a half life of 24.50days.His spaceship traveled at twice the speed of light (warp 2). Upon arrival on earth he only had 0.50g of Q remaining.if the speed of light is 3*10^8m/sec, how far away is vulcan? (Assume he took the shortest path from vulcan to earth)

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