For a substance the average life for alpha emission is 1620 years and for beta emission is 405 years. After how much time the 1/4 of the material remains after alpha and beta emission

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For a substance the average life for alpha emission is 1620 years and for beta emission is 405 years. After how much time the 1/4 of the material remains after alpha and beta emission
14
Sep
For a substance the average life for alpha emission is 1620 years and for beta emission is 405 years. After how much time the 1/4 of the material remains after alpha and beta emission For a substance the average life for alpha emission is 1620 years and for beta emission is 405 years. After how [...]
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