Radioactivity questions | form four Physics

A certain radioactive material has a half-life of 2 minutes. If the initial count rate is 256 per minute;
(i) how long does it take to reach a count rate of 32 per minute?
(ii) what fraction of the original number of atoms is left undecayed?

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UNSOLVED

What is meant by nuclear fission?

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A uranium nucleus, U-238, with atomic number 92, emits two α-particles and two β-particles and finally forms a thorium (Th) nucleus. Write the nuclear equation for this process.

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Define the following terms:
(i) binding energy.
(ii) thermonuclear fusion.

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A sample containing 400 g of iodine-131 has a half-life of 8 days. How much of the sample will remain undecayed after 40 days?

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UNSOLVED