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Question & Answer:
Question:A radioactive source has a half life of 6 years. The Activity of the source is 400 kBq.
How many decays occur in 30 seconds when the activity is 400KBq?
An activity of 400kBq means 400,000 decays per second. Therefore in 30s that means 400,000 x 30 decays = 12,000,000 decays. The equation is N = A x t.