The half life of a radioactive isotopes ...

The half life of a radioactive isotopes 'X' is 20 years . It decays to another element 'Y' which is stable . The two elements 'X' and 'Y' were found to be in the ratio of `1:7` in a sample of a given rock. The age of the rock was estimated to be :

40 years

60 years

80 years

100 years

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The half life of a radioactive isotopes X is 50 years . It decays to another element Y which is stable . The two elements X and Y were found to be in the ratio of 1:15 in a sample of a given rock. The age of the rock was estimated to be :

A radio isotopesX with a half life 1.4xx10^9 years decays of Y which is stable . A sample of the rock from a cave was found to contain X and Y in the ratio 1:7 . The age of the rock is:

Half lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. Calculate the ratio of decayed numbers of A and B nuclei after 80 minutes.

A radioactive nucleus X converts into stable nucleus Y. Half-life of X is 50 years. Calculate the age of radioactive sample when the ratio of X and Y is 1 : 15.

The age of a rock containing lead and uranium is equal to 1.5xx10^(9) years. The uranium is decaying into lead with half-life equal to 4.5xx10^(9) years. Find the ratio of lead to uranium present in the rock, assuming initially no lead was present in the rock. (Given : 2^(1//3)=1.259 )

Equal masses of two samples of charcoal A and B are burnt separately and the resulting carbon dioxide are collected in two vessels. The radioactivity of ^14 C is measured for both the gas samples. The gas from the charcoal A gives 2100 counts per week and the gas from the charcoal B gives 1400 counts per week. Find the age difference between the two samples. Half-life of ^14 C = 5730 y .

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