A radioactive material decays by simultaneous emission of three particles with respective half lives `t_(1),t_(2),t_(3)` minutes.The time in minutes after which `(1)/(3)` rd of material remains undecayed 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 decays by simultaneous emissions of two particles with half lives of 1400 years and 700 years respectively. What will be the time after the which one third of the material remains ? (Take ln 3 = 1.1)

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 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 ?

After a time equal to four half lives, the amount of radioactive material remaining undecayed 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 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