The decay constant of a radio active element, which disintergrates to `10 gms` from `20 gms` in `10` minutes is

The group of radio active element which can decay to give two noble gases is __________

20% of a radio active element disintergrates in 1 hr. The percentage of the radio active element disintergrated in 2 hrs will be

Half life of a radio active element is 5 min . 10 sec . Time taken for 90% of it to disintergrate is nearly

The count rate meter is used to measure that activity of a given amount of a radio active element. At one instant, the meter shows 475 counts/minute. Exactly 5 minutes later, is shown 270 counts/minute then The decay constant is

A sample of a radioactive element that contains 1.0 xx 10^(3) nuclie decays to 6.2 xx 10^(1) nuclei in 10minutes . What is its sepecific decay constant?

A samp,le of a radioactive elements that contains 1.0xx10^(3) nuclei decays to 6.2xx10^(1) nuclei in 10minutes. What is its specific day constant?

The half life period of radio active element is 140 days. After 560 days 1gm of element will reduce to

What is the relation between decay constant and half life of a radio active element?