Experiments show that radium decomposes at a rate proportioanl to the amount of radium present at the moment. If its half life is 1570 years, what percentage will disappear in one years?

Radium decomposes at a rate proportional to the quantity of radium present. It is found that in 25 years, aproximately 1.1% of a certain quantity of radium has decomposed. Determine approximately how long will it take for half of the original amount to decompose? (given log_e(.989)=-0.01106 and log_e 2=0.6931)

Half life of radium is 1600 years. Its average life:

A radioactive element has half life period 800 years. After 6400 years what amount will remain?

A certain radioactive material is known to decay at a rate proportional to the amount present. Initially there is 50 kg of the material present and after 2h it is observed that the material has lost 10% of its original mass. Based on these data answer the following questions. The time at which the material has decayed to one half of its initial mass is

If the earth be one-half its present distance from the sun, how many days will be in one year?

The population of a village increases continuously at the rate proportional to the number of its inhabitants present at any time. If the population of the village was 20, 000 in 1999 and 25000 in the year 2004, what will be the population of the village in 2009?

What amount is to be repaid on a loan on of Rs 5000 for 1(1)/(2) year at 10% p.a. compounded half yearly.

What amount is to be repaid on a loan of Rs. 12000 for 1 (1)/(2) years at 10% per annum compounded half yearly.

One gram radium is reduced by 2 milligram in 5 years by alpha -decay. Calculate the half period of radium.

Select the correct statement(s) : a) On bombarding ._(7)^(14)N nuclei with alpha -particle, the nuclei of the product formed after release of proton would be ._(8)^(17)O b) Decay constant does not depend upon temperature c) Nuclide and its decay product after alpha -emission are called isodiaphers d) Half-life of radium is 1580 years . Its average life will be 1097.22 years