1. Blackbody radiation
  2. Spontaneous emission
  3. Synchrotron radiation
  4. Planck's oscillation
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1 Answers

Answer: Option 2

Spontaneous emission is what you see with most "glow in the dark" toys. You excite the toy by exposing it to bright light, then the toy glows in the dark by spontaneously emitting photons as the excited atoms relax back down to their normal state.

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