The mean lives of a radioactive material for `alpha` and `beta ` radiations are 1620 and 520 years respectively . The material decays simultaneously for `alpha` and `beta` radiations. The time after which one fourth of the material remains undecayed in -

A radioactive material has mean lives of 1620 yr and 520 yr for alphaandbeta-"emission" , respectively. The material decays by simultaneous alphaandbeta-"emissions . The time in which 1/4th of the material remains intact is

A radioactive material has mean lives of 1620 yr and 520 yr for alphaandbeta-"emission" , respectively. The material decays by simultaneous alphaandbeta-"emissions . The time in which 1/4th of the material remains intact is

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 decays by simultaneous emission of two particles of half lives 1620 and 810 years. The time (in years) after which one-fourth of the material remains, 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 ?

Half lives for alpha and beta emission of a radioacative materila are 16 years and 48 years respectively. When material decays giving alpha and beta emission simultaneously, time in which 3//4^(th) material decays is .

Half lives for alpha and beta emission of a radioacative materila are 16 years and 48 years respectively. When material decays giving alpha and beta emission simultaneously, time in which 3//4^(th) material decays is .