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1. The half-like of 131I is 8 days. On a certain day, the activity of an...

1. The half-like of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What is its activity 40 days later?

2. Particles composed of quarks are

a) photons

b) leptons

c) leptons and quarks

d) neutrinos

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1)the activity after 40 days was found.

2) the particles are made up of quarks or not is given with explanation

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