what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
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why are radioactive isotopes that emit gamma rays useful for treating some forms of cancer
because gamma ray is highly penetrativeand energetic , this kill the cancerous cells.
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