Half of the original sample of a radio isotope remains after a half-life period. After two half-life periods, one-fourth of the radio isotope remains.
after 3 half lives you basically multiply a half by a half by a half. eg, .5 to the power of 3, gives 1/8. 1/2 first time, 1/4 second time, 1/8 third time
By definition, half the sample remains after one half-life.
Half of one half, or one quarter, remains after two half-lives, etc.
One quarter of the original. After one "half-life", half of the radioactive atoms will have broken up; after another half-life, half of the remainder will decay.
1/2 remains after 1 half life. So 1/2 x 1/2 = 1/4 remains after 2 half-lives.
Half of the former number of atoms
halflife
The length of time required for half of a sample of radioactive material to decay
This fraction is 12,5 %.
1/32
200
It tells what fraction of a radioactive sample remains after a certain length of time.
The fraction that remains is 1/8.
It is 1/8 .
1/8 of the original amount remains.
halflife
It tells what fraction of a radioactive sample remains after a certain length of time.
3.1 %
An eighth remains.
The length of time required for half of a sample of radioactive material to decay
This fraction is 12,5 %.
30,000
1.5% remains after 43.2 seconds.