The most penetratin type of radiation is the

A helium nucleus with two protons and two neutrons is called a(n)

Negatively charged particles emiitted from a nucleus at a high speed are

The process by which nuclei having low masses are united to form nuclei with large masses is

The splitting of the nucleus into two or more parts is called

One type of radioactive device that indicates the intensity of radiation with a clicking sound is a (an)

The three types of nuclear radiation with increasing order of penetrating power are

Thorium-234 has a half-life of 24 days. If you started with a 100 g sample of thorium-234, how much would remain after 48 days?

Neutrons released in a fission reaction can strike other nuclei and cause

The minimum amount of fissionable material that is required for fission to occurr is called

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