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When the nucleus that undergoes disintegration during a nuclear disintegration is called a parent nucleus and the nucleus which remains after the disintegration is called daughter nucleus. This law is known as Soddy and Fajan radioactive law.

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Important Questions on Nuclear Physics
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In a nuclear reaction given below, a nucleus changes to another nucleus .
What is atomic number and mass number of ?

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For which of the following radiations is the path not affected by electric field and why?
-rays, -rays, -rays.

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Give scientific explanation:
When the radiation coming out from certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.

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