The half life of `"_92^238U` against `alpha-decay` is `1.5 xx 10^17s`. What is the activity of a sample of `"_92^238U` having `25 xx 10^20` atoms?

Half life of "_92^238U against alpha-decay is 4.5 xx 10^9 years. Calculate activity of 1 g of sample "_92^238U .

The half-life of "_92^238U undergoing alpha decay is 4.5 xx 10^9 years. Calculate the activity of 10 g sample of "92^238U .

The half life of "_92^238U undergooing alpha today decay is 4.5 xx 10^9 years . Calculate the activity of 5 g sample of "_92^238U .

Tha half-life of U^(238) against alpha decays is 1.42 xx 10^(17)s .How many disintengrations per second occur in 1 g of U^(238) ?Given,Avogadro umber =6.02 xx 10^(23) mol^(-1) .

The value of decay constant of Co^(60) is 2.5xx 10^(-7)"min"^(-1) . The activity of 2.0 g of the sample is nearly :

The velocity of an e in excited state of H-atom is 1.093 xx 10^(6)m//s , what is the circumference of this orbit?

The radius of moon is 1.7 xx10^6m and its mass is 7.35xx 10^22 kg . What is the acceleration due to gravity on the surface of moon ? Given G = 6.67 xx 10 ^-11Nm^2//kg^2 .