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True or false? Nuclear fission is caused by firing a neutron at a fissionable nucleus.
What is enriched uranium?
Another term for U-235
A sample of uranium with about 2-3% fissionable U-235 in it
The term used for high-grade uranium
Which of these roles does water perform in a nuclear reactor?
Which part of the nuclear fission reactor is made out of boron?
Which type of nuclear reaction takes place in stars?
True or false? Two protons fuse to produce "heavy helium".
True or false? In a fusion reactor, the temperature must be very high to overcome forces of reaction and the plasma must be contained in a magnetic field.
What is the reaction product of fusion of hydrogen?
What type of radiation is radon gas a source of?
Where was there a nuclear accident in 1986?
How can workers reduce their radiation dose?
Keeping a safe distance from radiation sources
Using lead or concrete sources to shield themselves
Wearing rubber gloves
Drinking a glass of water after exposure
When was the Big Bang?
3 million years ago
13 million years ago
3 billion years ago
13 billion years ago
What name do we give a large cluster of stars?
True or false? The "Dark Age" of the universe began when the universe became transparent.
True or false? A protostar is a star that is at the end of its life cycle.
Which stages would you expect a star to go through if it were a small main sequence star?
Which stages would you expect a star to go through if it were a large main sequence star?
What is the heaviest element that can be formed by nuclear fusion?
True or false? Heavy elements such as lead are formed during supernovae.
True or false? The heaviest naturally-occurring element is mendelevium.