Quiz 15

The half-life of carbon 14 is 5730 years. If a 1-gram sample of old carbon is 1/8 as radioactive as 1-gram of a current sample, then the age of the old sample is about

17,200 years.

An atom with an imbalance of electrons to protons is

an ion.

Both X-rays and gamma rays are emitted from

different parts of the atom.

If carbon were used as nuclear fuel, it would be best

fused

The energy release in both fission and fusion is mainly in the form of

kinetic energy of fragments.

Compared to protons, the reason neutrons are effective nuclear bullets in nuclear reactions is that a neutron has

none of these

The half-life of an isotope is one day. At the end of two days the amount that remains is

one-quarter.

A nucleon has more potential energy with respect to a nucleus when it is

outside the nucleus.

Fusing two helium nuclei yields a net

release of energy.

An element emits 1 alpha particle, 1 positron, and 3 beta particles. Its atomic number

stays the same.