A radioactive substance decay 25% in 10 minutes . If at start there are `4 xx 10^(20)` atoms present. After how much time will the number of atoms be reduced t0 `10^(20)` atoms? (given In 3=1.098)

Fill in the blanks with appropriate items : A radioactive substance decays 20% in 10 min if at start there are 5 xx 10^(20) atoms present , after ________ hour the number of atoms will be reduced to 10^(18) .

The half life of radioactive substance is 1.1xx10^7 s. What is the decay rate for 4.4xx10^15 atoms of the substance ?

The half-life of a radioactive substance against alpha- decay is 1.2 xx 10^7 s . What is the decay rate for 4 xx 10^15 atoms of the substance ?

The half-life of a radioactive substance against alpha- decay is 1.2 xx 10^7 s . What is the decay rate for 4 xx 10^15 atoms of the substance ?

The half-life of a radioactive substance against alpha- decay is 1.2 xx 10^7 s . What is the decay rate for 4 xx 10^15 atoms of the substance ?

20% radioactive sample decay in time t. How much sample decay in time 2t ?

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

A radioactive substance takes 20 min to decay 25%. How much time will be taken to decay 75% :

A radioactive substance takes 20 min to decay 25%. How much time will be taken to decay 75% :