If light takes 4 billion years to reach us from a distant galaxy, how much further away is the distant galaxy than the Andromeda galaxy which is 2 million light years away?

a) 4 billion times
b) 200 times
c) 20 times
d) 2000 times
e) 2 million times


Ans: d) 2000 times

Physics & Space Science

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A hospital patient has been given a sample of 131I , which has a half-life of 8.04 days. This sample is decaying at 5.9 times the acceptable level for exposure to the general public

How long must the patient wait for the decay rate of the sample to reach the acceptable level? A) 21 days B) 14 days C) 9.9 days D) 8.9 days

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