Question

1. Detonation of a fission-type uranium bomb begins by ?

1. splitting uranium.
2. igniting a small conventional bomb.
3. pressing together pieces of uranium.
4. all of the above
5. none of the above

2. Earth's interior is warmed by ________ and Earth's surface is warmed by ________.

1. volcanoes; solar energy
2. radioactive processes; fusion in the Sun
3. terrestrial radiation; terrestrial radiation
4. fission; fossil fuels

Answer 1

1. a. Splitting uranium

When a free neutron hits the nucleus of a fissile atom like uranium-235 (²³⁵U), the uranium splits into two smaller atoms called fission fragments, plus more neutrons.

2.b.radioactive processes; fusion in the Sun

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