What was one of the earliest uses of uranium in the 19th century?, Uranium was used as a fluorescent glaze in Victorian glassware, producing bright yellow-green or orange decorative effects., How does uranium contribute to the presence of helium on Earth?, Through radioactive decay, uranium atoms release alpha particles, which are helium nuclei. Without uranium decay, helium would not naturally exist on Earth., What is the difference between uranium-235 and uranium-238?, Both isotopes have 92 protons, but they differ in neutrons and properties. Uranium-235 can sustain nuclear fission reactions and is used in nuclear power/weapons, while uranium-238 is more stable and less useful for energy release., What does “half-life” mean in the context of radioactivity?, Half-life is the time it takes for half of a radioactive material to decay. Short half-lives mean high radioactivity but quick disappearance; long half-lives mean lower intensity but longer-lasting radiation., Why is depleted uranium used in ammunition and aircraft?, Because uranium is extremely dense—denser than lead—making it effective for armor-piercing shells and as counterweights in aircraft., What is nuclear fission, and why is it important for power generation?, Nuclear fission is the process in which a uranium nucleus splits when struck by a neutron, releasing heat and more neutrons. This chain reaction produces the heat used in nuclear power stations to generate electricity., How much electricity does Sizewell B nuclear power station generate?, Sizewell B produces about 1200 megawatts of electricity, supplying power to around 2 million homes and about 3% of the UK’s electricity demand., What role do control rods play in a nuclear reactor?, Control rods, made of materials like silver, indium, and cadmium, absorb neutrons to regulate or stop the fission chain reaction. They drop into the reactor core in under two seconds if needed., Why is spent nuclear fuel stored underwater?, Water shields radiation, cools the hot fuel rods, and reduces the risk of accidental chain reactions. Boron dissolved in the water also helps absorb neutrons., Why must nuclear waste be stored for thousands of years?, Because it remains highly radioactive for long periods, posing hazards that require safe, long-term containment., How does nuclear power compare to coal in terms of radiation and CO₂ emissions?, Surprisingly, coal plants release more radiation than most nuclear plants and also emit vast amounts of CO₂, whereas nuclear is a low-carbon technology., What is “baseload” power, and why is nuclear suited to provide it?, Baseload is the minimum electricity demand that must be supplied continuously. Nuclear is well-suited because it provides steady, reliable power with a high capacity factor (~90%)., Why is the green movement split over nuclear energy?, Some environmentalists view nuclear as too risky due to radiation and accidents, while others see it as essential for reducing CO₂ emissions and combating climate change., What was Germany’s decision regarding nuclear and coal, and why is it controversial?, Germany decided to phase out nuclear power by 2022, but has continued building and operating coal (especially brown coal) plants, which are more carbon-intensive, leading critics to argue that this undermines climate goals., How do supporters argue nuclear and renewables can work together?, They argue that combining nuclear (steady baseload) with renewables (variable, weather-dependent) allows for reliable low-carbon electricity while phasing out fossil fuels.

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