Question: A light - emitting diode ( LED ) connected to a 3 . 0 V power supply emits 4 4 0 nm blue light. The

A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 21 mA , and the LED is 56% efficient at converting electric power input into light power output.

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