Why does radioactive decay happen at random times?
Quick Answer
Radioactive decay is a quantum process, so you can predict the chance of decay over time but not the exact moment a single atom will decay. The randomness is built into quantum physics.
The Full Story
An unstable nucleus can transform into a more stable one by emitting particles or energy, such as alpha, beta, or gamma radiation. Quantum mechanics describes this as a probabilistic process, meaning each nucleus has a certain chance of decaying in a given time interval. For a large number of atoms, the average behavior is very predictable and follows half-life. But for one specific atom, the exact time of decay cannot be known in advance. This apparent unpredictability is one of the most famous features of quantum physics.
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