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1. Who discovered natural radioactivity?
Natural radioactivity was first discovered by .
2. Which radioactive material is present in the ore of pitchblende?
The radioactive material present in the ore of pitchblende is .
3. Write any two elements which are used for inducing radioactivity?
(i)
(ii)
4. Write the name of the electromagnetic radiation which is emitted during a natural radioactivity.
The electromagnetic radiation which is emitted during a natural radioactivity is .
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