`._(92)^(238)U` atom distintgrates to `._(84)^(214) Po` with a half life of `4.5xx10^(9)` years by emitting six alpha particles and n electrons. Here n is -

The nucleus ._(92)U^(238) is unstable angainst alpha decay with half-life of 4.5 xx 10^(9) years. Estimate the kinetic energy of the emitted alpha -particle. Mass of the ._(92)U^(238) atom = 238.05081 u Mass of the ._(2)He^(4) atom = 4.00260 u Mass of the ._(90)Th^(234) atom = 234.04363 u

The radioactive substance ""_(92)U^(238) has a half-life of 4.5 xx 10^(9) years. Determine the time taken for 3/4 of the substance to disintegrate.

(a) On analysis a sample of uranium ore was found to contian 0.277g of ._(82)Pb^(206) and 1.667g of ._(92)Pb^(206) and 1.667g of ._(92)U^(238) . The half life period of U^(238) is 4.51xx10^(9) year. IF all the lead were assumed to have come from decay of ._(92)U^(238) , What is the age of earth? (b) An ore of ._(92)U^(238) is found to contain ._(92)U^(238) and ._(82)Pb^(206) in the weight ratio of 1: 0.1 The half-life period of ._(92)U^(238) is 4.5xx10^(9) year. Caluculate the age of ore.

(a) On analysis a sample of uranium ore was found to contain 0.277g of ._(82)Pb^(206) and 1.667g of ._(92)U^(238) . The half life period of U^(238) is 4.51xx10^(9) year. If all the lead were assumed to have come from decay of ._(92)U^(238) , What is the age of earth? (b) An ore of ._(92)U^(238) is found to contain ._(92)U^(238) and ._(82)Pb^(206) in the weight ratio of 1: 0.1 The half-life period of ._(92)U^(238) is 4.5xx10^(9) year. Calculate the age of ore.

Calculate half life of ^238 U if 1 gram of uraninum emits 1.23 xx 10^4 alpha particles per sec.

The atomic ratio between the uranium isotopes .^(238)U and.^(234)U in a mineral sample is found to be 1.8xx10^(4) . The half life of .^(234)U is T_((1)/(2))(234)=2.5xx10^(5) years. The half - life of .^(238)U is -

The atomic ratio between the uranium isotopes .^(238)U and.^(234)U in a mineral sample is found to be 1.8xx10^(4) . The half life of .^(234)U is T_((1)/(2))(234)=2.5xx10^(5) years. The half - life of .^(238)U is -

N atoms of a radioactive element emit n , alpha particles per sec. Half life of the element is

On analysis a sample of uranium are was found to contain 227g of ._(82)Pb^(208) and 1.667 g of ._(92)U^(238) . The half life peiod of U^(238) is 4.51 xx 10^(9) yrs. If all the lead was assumed to have come from decay of ._(92)U^(238) , what is the age of the earth?

._(92)U^(238) is radioactive and it emits alpha and beta particles to form ._(82)Pb^(206). Calculate the number of alpha and beta particles emitted in this conversion. An ore of ._(92)U^(238) is found ot contain ._(92)U^(238) and _(82)Pb^(206) in the weight ratio of 1: 0.1. The half- life -period of ._(92)U^(238) is 4.5xx 10^(9) yr. Calculate the age of the ore.