A typical glow-in-the-dark toothbrush emits a greenish-yellow light. (Or, maybe its a yellowish-green light.) It stops emitting when placed in liquid nitrogen --- a temperature of -196°C. We do not yet know the exact temperature that the emission strats as the toothbrush warms. For now, let us assume that emission starts at -100°C. Use this information to create an energy band model for the toothbrush.
