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After 1 alpha and 2 beta emissions....

After `1 alpha` and `2 beta` emissions.

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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 ?

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 ?

A radioactive material has mean lives of 1620 years and 660 years for alpha and beta emissions respectively the material decays by simultaneous alpha and beta emission. The time in which (1)/(4)th of the material remains intact is-

A radioactive material has a half life of 600 years and 300 years for alpha and beta emissions respectively. The material decays by simultaneous alpha and beta emissions respectively . The material decays by simultaneously alpha and beta emissions . What is time in which 3/4 th of the material will decay ?

A radioactive material has a half life of 600 years and 300 years for alpha and beta emissions respectively. The material decays by simultaneous alpha and beta emissions respectively . The material decays by simultaneously alpha and beta emissions . What is time in which 3/4 th of the material will decay ?

The mean lives of a radioactive substance are 1620 years and 405 years for alpha emission and beta emission respectively. Find out the time during which three fourth of a sample will decay if it is decaying both by alpha -emission and beta -emission simultaneously. (log_e4=1.386).

The mean lives of a radioactive substance are 1620 years and 405 years for alpha emission and beta emission respectively. Find out the time during which three fourth of a sample will decay if it is decaying both by alpha -emission and beta -emission simultaneously. (log_e4=1.386).

The mean lives of a radioactive substance are 1620 years and 405 years for alpha emission and beta emission respectively. Find out the time during which three fourth of a sample will decay if it is decaying both by alpha -emission and beta -emission simultaneously. (log_e4=1.386).

The mean lives of a radioactive substance are T^(1) and T^(2) for alpha- emission and beta- emission respectively. If it is decaying by both beta- emission and beta - emission simultaneously then find its mean life and decay constant ?