Nuclear Fission and Fusion quiz

More questions about Nuclear Fission and Fusion

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1. 1 Easy

   Which equation explains where fusion energy comes from?

   Answer: E = mc²

   Why: One gram of mass equals about 90 trillion joules, roughly what a one-gigawatt power station makes in a day.

2. 2 Medium

   Which isotope makes up over 99% of natural uranium?

   Answer: Uranium-238

   Why: Natural uranium is only about 0.7% uranium-235, while most reactors run on fuel enriched to 3 to 5%.

3. 3 Hard

   What gives off about as much heat per cubic metre as the Sun's core?

   Answer: A compost heap

   Why: At about 276 watts per cubic metre, the core's peak output is lower than an adult human body's metabolism.

4. 4 Easy

   Who led the team behind the first human-made nuclear reactor?

   Answer: Enrico Fermi

   Why: Chicago Pile-1 sustained its first chain reaction on 2 December 1942, beneath the stands of a University of Chicago sports field.

5. 5 Medium

   How does ITER's plasma temperature compare with the Sun's core?

   Answer: About 10 times hotter

   Why: Reactors lack the Sun's crushing gravity, which packs its core densely, so they make up for it with extra heat.

6. 6 Hard

   Which process makes most elements heavier than iron?

   Answer: Neutron capture

   Why: About half of the nuclei heavier than iron come from rapid neutron capture, the r-process, and most of the rest from the slower s-process.