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Helium, lithium and gamma rays in food

Helium and lithium are two elements that differ only in one electron. Why do you think they exhibit such different chemical and physical behavior?

Why is food irradiated with gamma rays from a Cobalt-60 source? Does the food become radioactive? Discuss your answer.

Is carbon dating more appropriate to measure the age of materials that are a few years old, or a few thousand years old or a few million years old?

Solution Summary

The solution provides some explanations for some applications of physics knowledge.