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[" Q.4"" A radioactive material emits "2...

[" Q.4"" A radioactive material emits "20 beta" -particles per "],[" sec at "10^(@)C" .If the temperature is increased to "],[20^(@)C" then the emission rate of "beta" -particles per "],[" sec is - "],[[" (1) "20," (2) "40],[" (3) "30," (4) "1]]

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