Tritium, (3/1) H, decays by beta decay with a half-life of 12.3 years. How long will it take for a sample
of tritium to decay to 1.5% of its original value?
(A) 24.6 years
(B) 49.2 years
(C) 36.9 years
(D) 12.3 years

Answer is C, but I keep getting the wrong answer (I’m getting 73.8 years which isn’t even an option).

What are the three major branches of natural science? • earth and space science, life science, physical science •earth and space science, physical science, chemistry •physical science, life science, chemistry •life science, chemistry, physics

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum