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प्रश्न
Name two radioactive substances.
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उत्तर
Two radioactive substances are Uranium, Radium.
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संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
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(i) Name the radiations which are charged.
(ii) Name the radiations which are most penetrating.
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(iv) Name the radiations which have the largest mass.
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